Depends on the state, Colorado charges a percentage of the list price decreasing every year for 10 years down to a fixed fee. And yes that was a small factor in deciding if we wanted to get a newer or older coach. Folks with new high dollar vehicles/RVs get nailed, my '06 F-250 was a bit over $500 when we moved here in '06, now it's down to high $200s. The '99 Alpine is under $200, even though there are weight fees for RVs.
'99 Alpine 36SDS/8.3 ISC 330 Cummins
Or
'05 Lance 845
'06 Super duty SC/SB 6.0
Upgrades include: StabilLoads, Air Bags & Timbrens,Swaybars
Usually towing an '01 Wrangler, lifted/locked on 35"s or a mildly built '98 Cherokee on 33"s (only one locker)