Load ramps

Looking for some thoughts or ideas on portable load ramps to get into a van trailer to load bundles. I currently load from the ground with a telehandler and push all bales to the front from the ground.

In case my Tele is down, at a different location, or busy, I'd like to be able to load bundles with my skid steer. But to do that I need to go into the van. Best thing would be make a permanent dock , but I can't do that because I could be in a few different locations.

I'm assuming I'd have to have some long ramps to decrease my chanses of rolling backwards. Any pictures or thoughts are apreciated

Load ramps