After using a bunk trailer for some years, I recently purchased a 23ft bowrider that came with a tandem, galvanized roller trailer. I am still trying to get used the differences but since most people at the ramps that I go to have bunk trailers, it is hard to pick up some tips. The roller set up is, 4 sets of 4 rollers in the front and 4 sets of 4 rollers in the back (32 rollers in all) all of which pivot left to right and back on forth in some manner. <br /><br />My biggest questions are:<br /><br />How far down the ramp should the trailer go while launching and retrieving? My understanding was that the biggest feature of the roller trailer is that it does not need to be in submerged in the water, at all. In fact, I was told it only needs to go down the ramp until the rear tire touches the water. This just seams odd as that means I would have to crank the boat all the way up the trailer by the bow hook during retrieval. I know that they reinforce the bow hook area but it seams like a lot weight on that one area. Also, I would have to push the boat down the rollers during launching. <br /><br />Also, I recently had a small emergency in which I had entirely submerged the trailer, like a bunk trailer, all of the way into the water and I was not able to hose it off afterwards. I have noticed some surface rust that I want to take of before it becomes a bigger problem. I was planning on getting a wire brush or a wire wheel on a handheld grinder to remove the surface rust and then spraying it with a can of the Spray Cold Galvanizing. Has anybody had any luck with this? Any other thoughts? It is not bad enough to have the entire thing hot dipped. <br /><br />I have used this trailer a couple of times and I have not seen any reason to convert it to bunk so any tips on roller trailering would be appreciated. 
