The 2017 Montna legislature changed the fees for higher end RVs and cars.
Here's the applicable code for registering a MH in Montana:
https://leg.mt.gov/bills/mca/title_0...0030-0210.html
(7) (a) Except as provided in subsection (7)(c), the annual registration fee for a motor home, based on the age of the motor home, is as follows:
(i) less than 2 years old, $282.50;
(ii) 2 years old and less than 5 years old, $224.25;
(iii) 5 years old and less than 8 years old, $132.50; and
(iv) 8 years old and older, $97.50.
(b) The owner of a motor home that is 11 years old or older and that is subject to the registration fee under this section may permanently register the motor home upon payment of:
(i) a one-time registration fee of $237.50;
(ii) unless a new set of license plates is being issued, an insurance verification fee of $5, which must be deposited in the account established under
61-6-158;
(iii) if applicable, five times the renewal fees for personalized license plates under
61-3-406; and
(iv) if applicable, the donation fee for a generic specialty license plate under
61-3-480 or a collegiate license plate under
61-3-465.
(c)
For a motor home with a manufacturer's suggested retail price of more than $300,000 that is 10 years old or less, the annual registration fee is the amount provided in subsection (7)(a) plus $800.