I have a pickup and 5th wheel. I never leave home with out a spare.
I spent a few years over the road trucking. Sometimes I had a spare sometimes I didn't. The times I didn't I regretted it. If you have a problem with a tire you may have trouble getting one your size. Tire repair shops don't carry all sizes at all times. They may have to order one. Sometimes that can take a couple days.
You don't need a brand new tire for a spare. A used one off the rim would be enough to satisfy even my OCD. If you have trouble you know you have a tire to get you to another place where you can buy a new one.
Some people will say they don't carry one cause they never needed one. Some people say that's what road side service is for. I prefer to be prepared. There is a lot of desolate country out there to be stranded in. Been there.
93 Jayco RK 325
07 Chevy classic crew cab long box LBZ Duramax
Farmer, Trucker, Equipment operator, Mechanic