Lowest cost trailers are "fits-all" adjustable models with minimal or non-existant prop cage protection. A local user couldn't wait for me to fabricate a replacement for him so he bought a semi-custom ski boat trailer, and is having buyers remorse after 2 seasons on it. A true ski boat trailer is fabricated to match the underside of the boat & contact is made in relationship to the stringers. Also care is given to protect the underwater drive train, and loading consideration. I've seen fits-all single axle trailers with brakes from $1800-2500, custom trailers run 3500+. Things to look for:
Axle capacity (500# more than you need)
Wheel & tire capacity
Brakes (drums good, disc. better, S.S. lines are best)
Torsion suspension (seen alot of broken leaf springs in my day, never a broken torsion hub)
Dream Trailer for Advance:
Single axle, torsion suspension, disc brakes, s.s. line set
Painted channel steel chassis -or- aluminum tube
prop guard
side guides
LED lights
Sealed wiring
Aluminum diamond plate steps
Spare tire w/ hub
Auto-Load system
