Sense Harbor Freight has been mentioned I looked at their latest sale flyer. This is a nice set for the money.
Home Tool Kit - Save on this 105 Piece Home Tool Kit
I have a set I have put together but this looks like a good place to start. I am sure I would add a few things but am always adding to the set I am using now, LOL!
Let see, need a hammer, duct tape, electrical tape, shrink wrap or wire nuts, wire ties, plumbers epoxy, aluminum tape, screw assortment, drill bits, level ect... I am sure I missed a few things such as compartment clip, nice to have for when one breaks. Oh ya, the Harbor Freight 18 volt cordless drill, flash light and 1/4" impact. Not the best but great for the trailer. My Ryobi one+ set is at home.
I try to keep the weight down but that is not easy. My tools are probably the heaviest thing I carry not counting water and propane.
What I don't have listed I probably have at home!