Do you need a separate bill of sale?
Not valid for transfer — but get one anyway
Alaska says a bill of sale is NOT valid for ownership transfer — and then, in the same breath, that it is a good idea to have the buyer sign one, because it “could be invaluable if the buyer receives parking tickets, etc. on the vehicle after the vehicle is no longer in your possession.” Include the serial number and description of the vehicle, both printed names, the date of sale and both signatures.
Source: Alaska DMV, Selling a Vehicle in Alaska