steveh27,
If your RV is non-motorized in Michigan it should have a never ending registration and license plate with no future cost for as long as you own it after the initial registering there of. Cheaper each and every year owned and/or used. Motorized RV's do require yearly registrations and they aren't cheap.
One of many reasons we don't buy class A's or C's any more. The tow vehicle's truck's yearly registration is just a fraction of a motorized RV registration yearly costs and also just a very small fraction of the cost to insure also or the towable RV's too. What's not to like about that??? We are not gullible to that insanity of the waste of real money year after year! Live and learn and we have so well. A motorized RV's is a one purpose hole you constantly pour real money into yearly and then it still depreciates in value so darn fast each year anyway.