I like the weight of aluminum but no way would I spend almost $700 on a set of aluminum ramps when I could build steel for a couple hundred. It looks like most steel ramps are built to load caterpillars with and could be lighter for most all applications but since the trailer guys dont know what you are going to put on them, they use much stronger material than needed.
Last tractor with FEL that I loaded on my trailer, I just chocked the trailer wheels to keep the trailer in place as it wasnt hooked to the truck, lowered the FEL onto the trailer to push the trailer down and then drove the tractor up onto the trailer. Worked perfect and no heavy ramps to handle. I did this after watching a friend load his backhoe onto a trailer that was hooked to his truck. It just raised the truck up about a foot, so it can be done when attached but it looked like it put some strain on the trailer hitch that way. With it unhooked, the trailer tongue just raises up and the dovetail hits the ground so it loads easy.