electrical, surge protector, 30/50/110 fuse panel * converter, inverter 12 v extension, 30 amp stepdown, 110 v plumbing, toilet, shower controls, water, splitter city water, surge protector fresh water tank, pump water heater extra hose sewer, black & gray, tank minder, flush black tank honey wagon, dump station heating & a/c, hood, leaks, 110 v 220, 12v controls jacks & stablizers, self-leveling tires, converting to higher grade tires - axle & wheel spacing spare tire, tighten, changing tire, take 2nd spare? carry extra lugnuts, tire guages, SP, don't use regular tires don't take too much, overload tires know tire rating & psi, speed truck stops - Pilot, Flying J scales gas, diesel, DEF, tractor vs reefer 5-th wheel plate, grease, hitch, king pin attach/detach, umbilical cord, 7-pole plugs (color code) roaches & ants microwave, 12v control battery, long jumper cables steps, handle windows, drapes walkie-talkies beds fireplace, swap out furniture, straps compressor, generator fresh air vents propane tanks, guages, grill adapter oven pilot light, burners, heater, fridge slideouts, cables, replacing cables, types, manual op lubrication, stairs, jacks, 5th wheel, stabelizers caulking, rooftop vents tv, off-air (fragile) Winegard, antenna DTV, swm tv cable, lines, basement tv interior & exterior lights, kitchen canopy replacement door latch tookbox, tools wheel chocks, levelers, leveling, wood under jacks rope lights central vac, motor, filters, extending to basement detectors videos, photos, words backing up, turning trailer height and weight you don't have to pull into highway weigh stations dry camping, off-the-grid, honey wagon 4 seasons coolers (long cord), 2nd fridge, freezer, ice maker can set outside under trailer, may have to pay extra * flip fuse or c.b. then try to find out what it controls. will also give clue to possible other things. make a diagram. - - - google earth phone apps, costco truck stops pets pantry