I have the exact same setup. Absolutely love it.I have a Tundra with topper...works great! I haven't gone to the trouble of tricking it out with a platform. If I spent weeks in the field I likely would consider a platform. I have plenty of room behind the seat and beside me in the bed for gear. I have a padded bedrug bedliner in the bed, sides, and topper which insulate it a little. I cover the bed with a tarp when hauling leaves, etc....sometimes tricky to keep clean. It's super nice having the mobility to sleep in the topper where ever I end up for the night.
No mods, I just use my little 12v pump instead of Co2. I have a tap for pressurizing and water dispensing. The other tap I put hose fittings on for filling the keg. I also have a hand pump party tap as a backup. Would suck to have a keg full of water and no way to use if something breaks.JoeDirt. How do you pressurize your keg for water and did you modify it for this? Interested in this since I have a couple kegs laying around.