TT tools

duct tape, electrical tape, zip ties, screw driver (Phillips and flat), crest wrench, rope, WD40, hammer, dykes, razor knife, extra screws, nuts to name a few.

Don't forget about your adaptors, 15amp to 30amp, 30amp to 15amp, 50amp to 30amp and plastic levelers....

and a reallybig hammer it can fix anything

Multi meter, outlet tester,

I went to sears and bought one of the tool kits in a black box, threw in a hammer for good measure and some tape and silicone spray. I'm good to go.

Super Glue, Gorilla glue, Elec. tape, Duct Tape, small plastic anchors, small wire nuts, Indus. Velcro, water hose washers, Various wood and sheet metal screws, backup water heater plug, volt meter, receptacle volt tester, putty knife, 3n1 oil, caulking/gun, bailing wire, med. size cotter pins, measuring tape, few extra cable connectors, graphite lubricant, cable ties (various sizes), small amount of steel wool, rope (various widths/lengths), allen wrench set, mending plates, corner brackets, misc. washers, small bolts, small hammer, pliers, Kobolt screw driver set, etrabond tape, extra hitch pins, hot glue gun, dremel.

I have a screw driver. Had some pliers, but lost them somewhere.

Our TT tools that stay in the trailer

Set of wrenches and sockets, allen keys
Screwdrivers
Pliers
Punch
Hammer
Extra pins for hitch set up, small pins for jacks
Duct tape, electrical tester and wiring bits and pieces
12V cordless drill and charger 2 batteries various screws for inside and out
Various plumbing bits
Extra light bulbs for inside and outside, fuses
Lubricant and sealer
Grease gun

I am sure I have forgotten some things we have. We carry the same on our boat and in the truck.

What everyone else has said plus my addition of a really big pry bar.

What everyone said previously plus all the tools to change a tire, a spare set of bearings, seals, grease and races, and the tools to change one at the side of the road.

If your the DIY type then a brake adjusting spoon can come in handy in an emergency.