It's not recommended to rotate tires on a MH which is why you are having difficulty finding a place to do it. MH tires don't wear like car tires. Cars have much more lateral friction on the tire due to turning etc. Not to mention car tires are run a lot more miles than MH tires. Your MH tires will dry rot long before you have tread wear excessive enough to replace them. If you are showing signs of uneven wear that's more likely an alignment or inflation problem and can't be fixed by rotating them. That said, if you are dead set on rotating them, find a truck shop. They'll look at you funny, but they'll take your money.
Looks like you asked the same question back in Sep and got pretty much the same answers. Save your money.