In a class C / class A once you get to a campground your mobility is limited. Enter the toad (towed vehicle). Now you're renting two vehicles!
If you went with a 5th wheel trailer you'd be able to use the tow vehicle for sightseeing, groceries, etc.
I like the buy & drive option even with tremendous depreciation. Renting for a month would be pretty expensive. Put it on a consignment lot when you're done, take the hit and fly home. My GUESS is that would be cheaper than renting.
Just my opinion.
Best,
- bob