You have to pay for waste dumping, water, fuels (for movement - brutal MPG - and heating), battery replacement (admittedly years apart), you can't just park it anywhere without totalitarians taking your money by force, so you have to pay rent at RV parks & campsites...
And maintenance of repair. Not to mention many of these RV are ridiculous over price.
Cheaper buy a HUD home in one of the suburb area for less than 100k with less headache.