How would out the door help you when TTL vary greatly from state to state? The best price comparison is done without including any add ons or TTL. All you should be looking at is dealer discount and rebates. Maybe fees if you are in an area where fees can vary.What I'd like to know is are the prices you're putting include aftermarket things like extended warranties and all the other options?
Just based off the experience on getting a new fifth wheel, I would think that a 10% discount would be paid back to the dealer with the customer purchasing aftermarket options and then taxes. The price out the door price with tags on the truck, taxes paid, and aftermarket options, is what would really help me plan what I should spend.
Other things like extended warranties can be price compared aside from the truck pricing.