Tons of problems! Rv complete shutdown while driving?!

Check the positive battery cables. If you have 2 main cables coming off the battery there is a spacer between the cables. I had the same problem with my big block Chevy. Would shut off at stoplites etc. Found the spacer was corroaded away. Cables were tight and you cant see the spacer until you remove them. We got good at the wife holding the key to start while I got out and wiggled the cables to start. Could do it before the lite went green.