Thanks for the help Blakkmoon! We are going for pretty inexpensive grilled cheeses not exceeding $5 per to stay competitive around the bars here. Good luck with your truck!
I really like the idea of replacing the grill with a propane griddle. Any recommendations on where to be keeping an eye out for used carts? There seem to be a lot of places out there to keep track of.
Also, for modifying carts, are the dimensions of add-ons pretty standard? Any resources you know of that I can read up on to get a feel for what I need to do to prepare for a modification?