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How to size a trailer for a boat??

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  • How to size a trailer for a boat??

    I pretty much KNOW my trailer is too big for my boat. IS there any information out there were I can properly know what size trailer to get for my boat. MY BIL is the orig. owner and has bragged that is is the smallest boat that will fit on that trailer...and it does fit and tow nice. The problem is that the boat sits too far UP on the current Roller trailer. At the docks whenever we go I have to go down the ramp a couple of times and slam on brakes to get sucker to roll/drop off. and when putting back on I basically have to winch it up onto the trailer with the strap like 20'. Im trying to get my trailer info now but its a 91 sunbird swl 207 so its basically 21' and about 3500 lbs roughly. My touch is way long and the uprights for the bow stop is PAST the back there the trailer branches out for the sides from the tongue......

    I can lower the boat any on the trailer and the gun walls are about 1.25" above the fender. Widening the rollers doesnt get it sit lower either. It tows fine Im more concerned about high she sits and properly and safely getting in and out of the water. It FALLS into the water when I launch it. When I have a dock it was once or twice a year but we are not docking anymore and I need to know what size trailer. she how a big teak bow platforms that extends out making it say 20.7' but the boat is a 19' I think.

    Any help greatly appreciated.


  • #2
    Re: How to size a trailer for a boat??

    got some pics?

    As in a BUNCH
    2000 Crownline 248 BR
    454 MPI Bravo III
    "Wet Lipps II"
    2006 Dodge CTD 3500 4X4 Bighorn Edition
    sigpic

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    • #3
      Re: How to size a trailer for a boat??

      general rule of thumb is that the overall trailer length should be 10% more than the base boat length not including added swim platform or bow pulpit.... This is just a starting point..... Of course there are other measurements.... on some trailers the bunks aren't adjustable so they need to match up too.
      Kevin

      But, where are the reevets?
      1981 Wellcraft V-20 CC Fisherman (FREE BOAT)
      1989 Wellcraft Monte Carlo 28(Build thread here)
      1992 Hotsports Jet'n'Cat Yam 701 WR3 drivetrain "SS George Washington"
      90's Yamaha WRIII and a pair of 95 Kawasaki ZXI-900's
      Fresh clean cheap oil is better then old dirty expensive oil any day
      sigpic

      Comment



      • #4
        Re: How to size a trailer for a boat??

        I will get a BUNCH OF PICS...as im sure that will help.....maybe I make it a BUNK trailer??

        OK...LOOK FORWARD TO IDEAS and what not. trying to find info on trailer...a karavan....only have VIN ..need to look up and see where model # might be.

        Thanks

        Comment



        • #5
          Re: How to size a trailer for a boat??

          I will take more...I know I have more of the trailer last time I was trying to figure this problem....I just cant find them all so I will take more.

          Click image for larger version

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          Im told that the boat and trailer are matched as far as weight. According to the dealer out of state that sold my BIL the trailer. But altimately I guess my problem is she sits way high....I will get pics but maybe if I convert bunk..I dont know. Really need to get to sit lower. The dock is a bear to winch that thing all the way back onto the trailer with the wheels at the edge of the dock in the water. trailer is submerged all the way.

          Comment



          • #6
            Re: How to size a trailer for a boat??

            are you using an electric winch?

            Comment



            • #7
              Re: How to size a trailer for a boat??

              Hard to tell in the pic but can you move the roller beams out from center.... If you can, that will lower the boat.
              Kevin

              But, where are the reevets?
              1981 Wellcraft V-20 CC Fisherman (FREE BOAT)
              1989 Wellcraft Monte Carlo 28(Build thread here)
              1992 Hotsports Jet'n'Cat Yam 701 WR3 drivetrain "SS George Washington"
              90's Yamaha WRIII and a pair of 95 Kawasaki ZXI-900's
              Fresh clean cheap oil is better then old dirty expensive oil any day
              sigpic

              Comment



              • #8
                Re: How to size a trailer for a boat??

                It does not lower much moving the rollers outward toward the outside ends as the "v" sorta flatish. I think I need to convert to bunk. I have taken ALOT of pics hope it helps. I have a lot of room to LOWER and the gunwall to V is a good 12 above the trailer fender. Most pics I see of boats trailered that area is INCHES from the fender. Here is my set up..hope this helps
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                • #9
                  Re: How to size a trailer for a boat??

                  Click image for larger version

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                  • #10
                    Re: How to size a trailer for a boat??

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                    • #11
                      Re: How to size a trailer for a boat??

                      does not want to allow me to upload more pics but I have more..and will try later. But I think my only option to lower say 10" is go to bunk. is 3200 or more lbs too much for a bunk trailer. I looked at all the parts for karavan trailers and no lower beams. I think I might gain an inch reversing the rollers if possible as they curve up but....
                      Do I need keel rollers?

                      Todd

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                      • #12
                        Re: How to size a trailer for a boat??

                        Originally posted by NYGiants View Post
                        are you using an electric winch?
                        no..not allowed in NY finger lakes for whatever reason. If so I'd install as I have to let out all the strap and basically winch onto the boat...and thats with the fender buried in the water!

                        Comment



                        • #13
                          Re: How to size a trailer for a boat??

                          you have a high profile setup on that trailer. You can get different brackets to lower the rollers

                          http://www.trailerpartsdepot.com/ite...atus=0&Tp=&Bc=

                          http://www.trailerpartsdepot.com/ite...atus=0&Tp=&Bc=

                          http://www.trailerpartsdepot.com/ite...atus=0&Tp=&Bc=
                          Kevin

                          But, where are the reevets?
                          1981 Wellcraft V-20 CC Fisherman (FREE BOAT)
                          1989 Wellcraft Monte Carlo 28(Build thread here)
                          1992 Hotsports Jet'n'Cat Yam 701 WR3 drivetrain "SS George Washington"
                          90's Yamaha WRIII and a pair of 95 Kawasaki ZXI-900's
                          Fresh clean cheap oil is better then old dirty expensive oil any day
                          sigpic

                          Comment



                          • #14
                            Re: How to size a trailer for a boat??

                            If you decide that you want a bunk trailer, just find a good deal on one and sell this one... converting is less than ideal and not a cheap as you might think.
                            Kevin

                            But, where are the reevets?
                            1981 Wellcraft V-20 CC Fisherman (FREE BOAT)
                            1989 Wellcraft Monte Carlo 28(Build thread here)
                            1992 Hotsports Jet'n'Cat Yam 701 WR3 drivetrain "SS George Washington"
                            90's Yamaha WRIII and a pair of 95 Kawasaki ZXI-900's
                            Fresh clean cheap oil is better then old dirty expensive oil any day
                            sigpic

                            Comment



                            • #15
                              Re: How to size a trailer for a boat??

                              Originally posted by smokeonthewater View Post
                              If you decide that you want a bunk trailer, just find a good deal on one and sell this one... converting is less than ideal and not a cheap as you might think.
                              That's what I'm working through now. Your right may not cost effective for what I'm starting to see

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