As far as Robertson screws, not a one in our MH that I've found and none that I can recall in the previous MH. As I mentioned I have a small set of SAE/Metric wrenches. A 1/4" drive socket set, bought that on the road to repair a leaking toilet valve, and a cheap set of 3/8" drive sockets, SAE and Metric, and ratchet. Screwdriver set, pliers, adjustable wrench, digital meter, wire strippers. I figure if it needs anything bigger than a 3/8" drive ratchet or the wrenches I have then it's something I'm not going to tackle on the road. You can take care of a lot of small problems with the basic tools. I'm not carrying any where near 100 lbs. of tools.