Added a second axle to trailer. Boat came with one 3500 lb axle. That seemed to light for the job.

Heavy duty vertical guides, from Calif. supplier.

Heavy duty vertical guides. These do not bend when bumped.

Heavy duty vertical guides. These won't bend. Wind, waves, current no problem. Steer the bow between these guides, steer the stern around, and power up to the winch. They solved my loading problems.