Our experience might be right up your alley. We purchased a 2013 Chevy 3500HD LWB Dually(see sig line for mods) and a 2013 AF 996. Couldn't be happier with our set up and yes, it's basically a AF990 with a kitchen slide. There is extra storage with that slide and being our first wet bath, we like it better as it allows for more kitchen counter space. Everything works great and it drives just fine. Not sure why the comment was made about rethinking your model choice if you have a LWB truck, that's what we have it fits fine. Chevy did make the rear stake pockets rounded which makes for close quarters loading, but home made guides have fixed that concern. Double check the match up of your camper front bumpers as it relates to your box front as Chevy's don't match up well, so I extended those. If you search for my posts you'll see some of the mods I've done, but feel free to PM me with any questions.
IMHO you've chosen a great floor plan and am confident you'll be very happy with your choice, we are!
