We worried about all of that when we bought our used MH. I was still working so we flew down on a weekend to get it. Here's what we were told by the DMVs and our insurance people.
Since the DMV was going to be closed for the weekend, don't worry about it. It did have expired Colorado tags on it. They said to have a signed bill of sale and a phone # that could be called if you were pulled over for some reason.
We didn't want to license it in Colorado again as that was expensive and not our home state. And the CO DMV said not to worry about it, we wouldn't be there long enough to be a concern to bother with temporary plates - it would take longer to go to the DMV and get them than it would to drive out of state.
State Farm said don't worry about it, you're insured just like if you borrowed the neighbor's MH for a weekend trip.
Drove it from Colorado to Washington, parked it at my brothers', flew home for a month, then flew back with plates and insurance paperwork to take it home through Canada.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.