Re:Tools. Most everything on the Sprinter is metric, however it is unlikely you will be doing anything on the Sprinter that needs more than a pliers or screwdriver. The coach will be mostly US, (non-metric). In any case I carry a simple tool kit that has a small ratchet metric and US set, with pliers, screwdrivers, etc. This is all for coach work, not the sprinter. (You probably don't carry tools in your normal car, except for tire changes. Same thing here. Coach items are the only thing you will work on, if that.
Take some black Racer Tape or Gaffers tape, some nylon tie wraps, and a small first aid kit. I am sure others will add, but keep in mind that RV is great, but you can run it out of storage room pretty quick...