Sell your truck in AK, buy another one down here and drive home. My experience is that vehicles are worth more in AK. You could have the electrical and tie down mods made to your new truck at FWC then enjoy your trip back to AK and do some fishing along the way. I also don't need to tell you that those tundra undellations in the Yukon to Tok Alaska Highway would require that you go mighty slow if you didn't have your new camper secured properly. Those undellations sneak up on you. I swear that I had air under my boat trailer tires a couple of times. It's weird how the road is great then you increase your speed and all of a sudden whoop, whoop,.... Woahhhhhhh Shite!!! You just can't see them coming at you. The other concern would be critter panic stops.
I don't think there is any out of state CA sales tax but not certain. Im thinking hat is taken care of when you license back in AK. If it is an issue, purchase it in OR. No sales tax there.