Plastic ramps will get it done for ya.
Drive up the ramps till the tires hit that 7” height difference, lift front axle with the loader, and drive up. You can put down chunks of 2x4 on the trailer deck where you’ll be sliding the loader if you’re worried about keeping it pristine.
Driving up using the loader to get the front tires in place would work, but unloading presents a new problem. You're dropping off that 7"....might be fun!