Re: Bunks or rollers?
Regarding the comment that it's near impossible to load a roller trailer alone and keep your feet dry... well, I do it all the time. And it doesn't require power loading, either.
Our trailer has a spare tire on the front that is vertically oriented on the right side. Before backing the trailer down the ramp, I roll out the winch strap about five feet, lock the winch and put the clip on top of the tire. Then I back the trailer in until the water is just at the top of the fenders. When I bring the boat onto the trailer, I snuggle the bow up to the forward rollers, keep the throttle in forward gear at idle so the boat will stay in position, walk up into the bow, reach out to pick up the winch strap from the spare tire and lean over the bow to hook it to the bow eye.
I've also done this with the winch clip put on a forward roller that is out of the water (instead of the spare tire), but I'm short and it's harder for me to reach that far down, but it can be done. The trick, and only with practice will it be mastered, is to make sure you have enough winch strap unrolled.
Keep in mind the tongue of the trailer and the winch itself is over water, so I can't winch the boat onto the trailer and keep my feet dry... not yet anyway.
Shut down engine, tilt drive up, hop out of the boat, walk up the courtesy dock so I'm even with the winch handle, then count the number of steps until I'm even with first dry land on the ramp (usually 2 or 3 steps). Now walk up to truck even with door handle, pace the same number of steps forward in parallel with the direction of the truck and eyeball a spot on the ground I think I can see from the driver's seat. Jump back in truck and slowly pull up those few feet so the door handle is even with my eyeballed spot, then stop and secure the parking brake. Hop out. Winch is now over dry land while the back of the boat is still in the water. Crank winch tight and fasten safety chain.
Lots of words, but it's all done in a matter of seconds, especially when using a ramp I know well (already know spot to pull up to).
And, as others have said, the roller trailer is a dream to use when water levels are down as they are in our area. Much easier to crank the boat than with bunks.
Sorry, I can't respond to claims that rollers will damage the hull. Our tinny is only two years old. So far, so good.