We had a small Class C years ago and did a big trip east coast to Yellowstone and down through the southwest along with a trip to FL and several smaller trips. We bought a three year old RV with about 4000 miles on it for half of retail. We kept it in perfect condition and sold it two years later for $500 less than we paid.
It was a great way to travel and we planned it to be a short term purchase. Thankfully, we never had any big issues with it. We cleaned it thoroughly after each trip, no smoking and no pets. IMO that makes all the difference in resale.
RV's are sold out everywhere now. In a year or two there will be lots of barely used rigs on the lots from people who found out it wasn't for them. Only buy new if you don't mind the huge depreciation. A lightly used rig will already have the "bugs" worked out. Try EVERYTHING, open every cabinet, have a mechanic inspect the engine, take it for a ride and trust your gut on the purchase.
Think seriously about how you will fill up the gas or diesel tank at a station. Many stations on the east coast are small and getting to a pump is impossible. Can you back up and turn the rig around if you end up in a weird spot? DH can drive anything thankfully, but I'd have a meltdown for sure! The convenience is incredible but the daily upkeep is a trade off. As OP's mentioned, renting to see if it is for you before you put down big $$ is a good idea.
Good luck!