I don't believe that if you live in CA you will be able to get away with not paying taxes. Or Any other state for that matter.
One poster said he thinks states have an agreement to collect taxes for the state of residence. Oregon does for CA by law.
If you think by keeping it out of state for a year, you will avoid taxes, you are dead wrong. CA DMV only has to check registration to know whether or not you paid taxes on the purchase. Now, you may buy something in a state with less tax and pay that tax. When you get back to CA (even after a year) you will pay the difference between the tax paid and what CA tax is.
For you that register in another state and tow a toad or get into a wreak in CA, unless your toad and DL is from the same state as the RV is registered in, you are in deep doo-doo. You not only will pay the delinquent CA tax, but there is a heavy fine.
Least you want to trash CA, you need to understand that many states do the exact same thing.
Oregon actively seeks out those who fraudulently register vehicles in their state and not only fine, but confiscate plates and notify the state of residence about what happened.
So, you are far better off just paying the CA tax and having a wonderful time with your new purchase!