it might be cheaper but the bi fold are not but around $100. they will last a longer than a wood ramp.

 

The wood ramps also get really dicey when they are wet or its snowing. Plus a little more work to anchor to the truck so they don't move.

Any ramp designed for this purpose should work. My advice is get something that works for you. I have a set of ramps that are 60in and super light. They also can be attached together (kinda looks like a door hinge) if you want them to fold up nice or are loading something smaller than an ATV. They are supper light and came with straps to hold the bottom to the truck/trailer.

They were also about $100 at Tractor Supply Co.

TG

 

Ours is like a tri-fold with three hinged sections and is 6 ft long.
It has chains that we hook to the metal staps that hold the tailgate
level when open.

It's aluminum, light weight and provides good traction with mud or
snow in the tires.

Safety should be your number one concern.