How often or ever should the tires be rotated on a c ?

I don't.
I have in tire TPMS sensors that are position sensative.

I have heard as long as they are wearing evenly, leave them alone and that is what I do. Regards, Dick

The purpose of rotation is to try to compensate for differences in wear at different positions, so that you can replace all tires at the same time, as a matched set. Uneven wear is particularly a problem with front wheel drive cars that are also heavy, so rotation pattern is front to back ( no crossing, for radials, some can handle it, others don't).

On a dually two axle truck, you might rotate inner dual one side with outer on other, or inner dual to same side front, or front with opposite side outer, and still avoid reversing rotation. Ford recommends only rotating fronts with spare, not worrying about rotation direction, to include the spare in the wear set, to replace those three tires at the same time.

I've watched for unusual or uneven wear on my tires, but in 30,000 miles, over six years, there was little wear at all before the tires needed replacement for age.

Interval? Oil change interval is roughly 5000 miles, I would consider doubling that on tire rotation, if doing it. Maybe longer, you could be looking at 50,000 to 80,000 miles of wear, before replacing because of tread wear.

Nope. Mine are wearing pretty uniformly so they'll all be ready for replacement when the time comes.

If one end of the RV wears out first (like the front), you can just replace them and do the rears when their time comes. The adage about replacing all tires at once applies to cars but not so much for RVs.

Lots of folks' tires age out before they wear out anyway.

I can't think of any practical way to do this. In my case, and probably in most others, you would have to take the MH to an RV repair facility and have them dismount the wheels and also remove the tires from the rims, then switch them out. Since the front and rear wheels are different, I can't see any other way to do it. Seems like it would be very expensive and probably not worth the trouble.

Thanks,my new ones after a year and 8,000 miles look to be wearing even so will just keep an eye on them.

I will replace my tires because of age long before there is any need to replace because of tread wear so I do not rotate tires on the RV

I think I'd be looking at the wear on the tires.
Being as most "C" MHs don't get a lot of miles on them, and the fact that most of the those miles are probably highway...you will probably be having the tires replace with age, before you need to rotate for wear.

What does the owners manual say about rotating the tires?
What does it say in your daily driver? I'm guessing that it's going to be something like 15-20K miles, which in a "C" may be 3-5 years.

Since you will never wear the tread off, I see no benefit of tire rotations.

Had 5 MH's and never rotated tires on any of them.