There is always the other way around, get a motorhome and tow a cheap car, almost all manual transmissions cars can be towed 4 wheels down with minimal modification. $15,000 for the motorhome, and $5,000 for a basic car already set up for towing 4 down (there have been 3 cars set up for towing 4 down listed on the IRV2 classifieds in the last 30 days, and another 3-4 under $6,000, as always asking and selling may not be the same thing)
p.s. I just googled monthly rates for a few places near here, SW LA / SE TX
Place 1, highway side commercial rv park has club house,some cabins, plus some outdoor activities in middle of nowhere east Texas $400 30 amp hookup $450 50 amp (daily is $30 per day) no mention of electric billed separate
Place 2 State ran recreation area in central Louisiana on a lake, ran by the Dept of Agriculture $270 per month electric and water, dump stations at exit, kicker is monthly is only in the winter off season Nov - March, 14 day stay limit the rest of the year, but daily rate starts at $22