The 13-ft Scamp has a recommended ball height of 18 inches while the 16-ft height is 21 if I recall correctly. So if @HyperionMark was successful I'm hoping I can be too.Also, considering that there is a ball rise limit on the Y of 0.75", you may run into difficulty trying to level your Scamp unless it just so happens to line up with the Model Y height.
In addition to @HyperionMark's great advice above, I'd add that a 14-50 extension cord is really helpful at campsites since the Tesla UMC often isn't long enough to reach without some awkward positioning. I always carry mine and run the extension under the camper. It also makes the car charging less obvious, which shouldn't be necessary but does limit the attention you might get about charging while camping. I've had a few unfriendly comments about it in the past.