Many motor homes do not have a lot of ferromagnetic roof, thus a mag mount won't mag.
However take another look at my last "hitch mount" purposal
For HF you can mount a very heavy antenna (Think Screwdriver) that way, I have a Hustler 4BTV bolted to a bike carrier on the back of my motor home,, It becomes a SBNTV when I'm mobile (Single band no trap, and frankly I have no clue which band) as I use other antennas.
That is for the tow vehicle
For VHF/UHF you could mount a "Mast" consisting of thick wall conduit or other reasonable mast pipe, you need something where you can weld or otherwise attach a "Nut" inside it to receive a bolt up from the hitch adapter
Then on the top end you cap it and drill the cap for a PL-259 type barrel connector/through wall. Drill a hole near the bottom for the coax, pass it up to the cap where you pl-259 it to the feed-through, use a PL-259 mount antenna, do not forget to use Dicor caulk or equal to seal both the top and the cable hole
Again, NO HOLES IN THE CAR
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