I priced a new GMC Denali diesel dually on nadaguides.com a few days ago. Just to see the difference I also priced an srw with the standard bed. The invoice difference was $181. It sure doesn't cost much to take a big jump in capacities. From what I can gather you must have a slide in camper and you would probably be close. Also, make sure the weights you are getting are for the Denali and not a bare bones model. There will be a difference. Check the sticker on the truck. I have to admit it was easier to get around town and park with our previous srw but like most things, you get used to it and adjust.