Dog Trainer,
Non-motorized RV's licensed in Michigan are permanent and have a one time fee of less than $300 and never have to be renewed again for as long as you own the RV. Very cheap!!!
It was your choice to own a motorized RV and thus must pay the costs for licening it then in Michigan or any other state. My Brother, who lives in Jupiter Florida, has a 35' class A MH and his yearly license fees are far from cheap by any stretch as I have seen the paperwork and add in high insurance costs for a MH and also not only the 7% state sales tax (6% in Michigan period with food and drugs exempt) but also the per county Florida sales taxes that make it around 9% to 10% actual sales tax. County sales taxes are also on fuel per gallon and fuel is far more expensive on average than in Michigan at the pump.
We winter in north central Florida about 50 miles SW of Gainesville for about 2-1/2 months each year and have for 5 years now and know. Also, groceries are much higher in Florida than in Michigan and groceries and CG's are even still much higher to outragous in South Florida yet as we used to winter down there before for 19 years.
Grew very tired of the swampiness, the bugs etc, the traffic jams, tiny jammed together RV sites, and overpriced everything in South Florida and miss it like having 2 broken arms!