I've had to modify my trailer in three ways to help launch/recover.

1. I had the front/length of the trailer extended 36 inches. That allows me
to get the stern of the boat into the water without getting the Tahoe wet.
( I'm in sal****er, and I try to avoid getting the vehicle wet). The added
length helped in backing up, and did not cause any "sway" etc. while towing
my little boat.

2. I had the axle reversed under/over. That means that the axle used to
be -below- the springs, it is now -above- the springs. That lowered the
effective trailer height. It also allowed the boat to reach the water
sooner.

3. I added strips of plastic ( cut-offs from a PVC lattice sheet from Home
Depot) on top of the bunks . The strips allow the boat to slide more easily
off and on.

All three modifications have each helped in their own way. Sometimes, when I
am on a particularly shallow/flat ramp, I still have to get wet to launch or
recover.

Part of my troubles is the length of my little 14 foot Carolina Skiff. Until
I did the above modifications, the boat wasn't long enough to reach the
water to help floating on or off.
RG