Our coach converter included extra parts:
-All engine belts (there are a lot as we have four alternators along with the big serpentine belt)
-A complete selection of fuses
-Volt tester
-Extra interior light bulbs
-Bottle jack and tool
-Extra shore power cord that connects at a different location
-Extra electrical attachments (50 to 30 amp connector, cheater double 30 amp connector)
-Air hose
-Trailer hitch insert
I do need to carry extra fuel filters, I will have to get those. I carried two extra filters with the other coach for 7.5 yrs. and never needed them (famous last words, right?).
I also carry:
-Antifreeze
-Engine oil
-All the incidentals...WD40, gorilla tape, duct tape, general tools, caulking, etc.
Safe travels,
MM.