You need to be able to convince your insurance company to show it as a 2001. Try a 2nd or 3rd insurance company.
The rules vary depending on which State you're in. There's some discussion on that here:
Contact Roadtrek and find out what assistance they can give you.
Toll-free: 1-888-ROADTREK (762-3873)
sales @ roadtrek.com
service @ roadtrek.com
stevem @ roadtrek.com (he's a member of this forum and might be able to help)
My thinking is that if you can get something on Roadtrek letterhead that clearly states that they sold it as a 2001 it might help with the insurance.