Montana offers permanent registration (if it's over 10 years old), pay it once and you're done. About $150 to $200 if I remember correctly... that's from my Dad licensing his 1977 Dodge W150 in Montana.
CA renewal for my M1010 (licensed as a passenger vehicle, not as a commercial truck) is $103 annually. Your M1009 should be similar.
EDIT: Called my Dad, his truck was $178, $12 of that was title fee, $10 for veteran's plates, $10 for donation to the veteran's cemetary, and $35 for the weight fee. You wouldn't have to pay a weight fee on the M1009 as it's a passenger vehicle, and regular plates would probably save you another $10, so it's likely to be less that $150 in Montana. Montana bases their fees on the residual (book) value, so it could be more or less.