Like many Senior members, I've had several campers, as well as 3 TT's and a 5'er. I can tell you the one thing you will DEARLY miss if you don't get it is a sofa.
Plan on getting a dually and at least a double-slide model with a sofa. The dinette in virtually any rig is just not a "kick back and relax" place to sit. Your only other choice is the bunk, or a campchair outside.
Not to start a SRW vs. DRW war again, but dually's handle the side-to-side sway motion much better, and of course, the obvious, you have a much higher payload.
As far as Crew-Cab vs. standard - I use my CC for storage when needed, and it is very handy when I do. Some folks have even taken out the back seat for more storage space. It's not that big of a handful to get anywhere, and in fact, having downsized from a TT, I think you will find it quite easy.
Here's mine--


