With an RV, you can mount a telescoping mast to the bumper or elsewhere and get a good signal out using it as a base. I have such an arrangement on my Land Cruiser, which puts the waterrproof box that holds the goTenna Mesh about 15 feet above the ground. I use one of those painter’s extendable handles, like used for rolling paint on ceilings, etc and bend the metal handle into a hook to use to hang a waterproof box from to hold your GTM.
This is the “big stick” disassembled.
And the mast erected for use.
I’ve also used this rig in Michigan’s UP to boost a cellphone up that high for reception in fringe areas so that others in the camp can use it as an internet hotspot when reception at ground level was bad or nonexistent. You could also do both if you have two of the waterproof boxes to use on the pole.