I can't add much to this.
Talking on the phone two days ago with a fellow RV enthusiast whose company used to do motorhome maintenance, I can stress that most of the rubber parts on your coach will need attention within ten years. Not just tires; hoses, belts, bushings, seals.
Tires comprise a big portion of the pre-purchase inspection. The DOT date is instrumental, with the first two digits signifying the week of the year, eg 13, and the second two digits the year itself. While Michelin and other tire companies now say that the old five year lifespan can generally be extended to ten if the condition of the rubber is monitored, I believe the concensus among owners is that we never use tires on the front wheels more than five.
I mention this, 'cause you can spend up to $5,000 extra, replacing tires alone.
For insurance, longtime coach owners suggested we visit Poliseek
for an insurance quote, and I was pleased at the result.
Generally, you have a 30-day grace period in which to complete the motor vehicle registration paperwork, and register the vehicle.
If you bought the unit at wholesale or salvage value; or if you did a "cash plus other value compensation" exchange, those numbers could be moot: the local office may enter your VIN and determine a "presumptive value" established by the jurisdiction. In our state, we are taxed 6.25% on 80% of the presumptive value.
As the spouse of a woman who owns two title companies, I applaud the sentiment of using them for closing; however, it is probably overkill in the case of most RV purchases. However, you have to be the judge of how much money is appropriate to achieve peace of mind.
As for us, we are now approaching the first month anniversary of our new purchase, and couldn't be happier with the decision.