Yeah, the way we use the truck, we don't do a lot of "get there and set up" type stuff. My wife LOVES roadtrips. She Loves the outdoors. But her major kryptonite is being bitten by bugs. She has that blood that bugs seem to love, and things get very un-fun very quickly if we are messing with tents at dusk and she gets eaten alive. So my main goal of most of this is to make sure that if she doesn't want to, we can do all of our camping without opening any doors. This means access from INSIDE the truck for all except the heavy stuff or things that would only be used outside. For example, the Stove, the lawn chairs, the mechanics tools, recovery gear, etc. All that is only accessible from the rear tailgate. But all the comfort stuff is accessible from INSIDE the truck. Very important (for us).
Doing things that way meant a few things for us...
1.) No need for drawers. Drawers add a ton of weight, are difficult to build (especially because trucks aren't very "Square") and are costly. So we skipped drawers completely. As for us, Drawers only make sense if you are pulling the truck up, and camping outside it (which we do not do).
2.) Less need for a heater. We used to use a catalytic heater to keep warm when winter camping. What we found was that if you never open the doors, and you insulate the truck (I tore out the whole interior and lined it all) then the truck stays mighty toasty! That saved us a bunch of space and added comfort as well.
Basically, I spent a lot of time making the truck into a mini-RV. As opposed to the classic "expo" rig with lots of fancy Zarges cases and kitchen box and stuff.
Hope this helps in thinking through things. Suburbans are colossal. And if you use it wisely, there's a LOT of space!