Based on your comment in the mattress thread about possibly sleeping in the Troopy at times, the 1st thing I'd recommend is to work out how you're going to accomodate that with all your gear and a fridge (yes, you want a fridge! which means a 2nd battery too most likely). You need to be able to put it somewhere to lay the matress(s) out. I'd contemplate installing a 'false floor' where the majority of your gear is stored under a floor that you can sleep on. The fridge would need to be located at the rear door along with some drawers (for cooking stuff, recovery gear). At the front end, have lift up sections to be able to get at the storage there. The rear of a Troopy is quite tall so I reckon you might get away with having the floor at the height needed to clear the fridge. Alternatively, have the false floor stop with enough room to put the fridge at the end and you'd just have to crawl around it to get in. That might depend on how long the area is and how tall you guys are.
You really have to weight up how likely you're going to need to sleep in the car before implementing something like this, however having all your gear packed away neatly would be good in the long run considering how long you're going to be on the road for.
Think about what your going to need each time you set up camp (tent, cooking, etc) and set it up so that can be done with a minimum of fuss. If you move frequently this would be a high priority, if you move once every few weeks then it's probably less of a problem.
Had a brother-in-law who had a Troopy which we used to go away fishing in. There is lots of room but you need to be smart in utilising it otherwise it will drive you mad! (since we were just going for the weekend everything just got chucked in but we didn't take much anyway... no hair dryers!
) I've seen pictures of Troopies with rear access doors added to make the space much more accessable, but things like that are going to be expensive.