I prefer Step levelers, ramps are scary to this camper.
In the demo the Andersen device sank half of it's thickness into the soft ground, in part because all of the
weight is concentrated into a very small part of the ramp, whereas steps and blocks distribute the
weight over a wider area. And what do you do when 1.5" isn't enough.
And then you have to pull the locking part out while the trailer is still on the ramps or deal with the ramp kicking up and damaging the trailer.
Once again, simple trumps fancy new gadgets, at least in this case.
And BTW: How do you use a level on the side wall of an FGRV? Not many of them are all that flat or at a right angle to the floor inside.