Ramps work great, used them for years, but should be secured well. I use a strap on each side and often another one down to the hitch. With no straps the ramp can push under the truck and come back and hit the rider, tragic accidents have happened.
When unloading if you slide a ski under the ramp on one side things get interesting and hard on taillights - the reason to snug each side into the tailgate.
I’ve never bent a tailgate loading ATVs or sleds, but plan to begin using plywood on my next truck after reading the broken tailgate thread.
And, good ramp traction is important. I’ve seen sleds on cabs, skis through rear windows, and other carnage when a spinning track hooks up.
I prefer hauling a sled in the pickup bed for traction and convenience. If we’re taking three machines the shortest one rides in the truck. A good cover makes a difference too, I really like my ride-on brp cover.