It has taken me 30 years to fine tune my "tool box" I carry in the camper. At first, I brought every tool in my garage. Found out as lot of stuff I drug along was foolishness. They were tools I'd never use.
They eventually got removed and others replaced. Finally, one year, I removed everything except a basic Robertson Headed screw driver (square head), a Phillips and a Flat. A pair of plyers, a pair of needle nose plyers, and a knife. A hatchet that had a hammer head and a hammer claw built into it.
Then, at home, or when traveling, I'd add only what I needed as I used it. If I used it on the camper for anything, it stayed in the camper. Eventually, I ended up with things like, a breaker bar and socket that fit the bolts on my Lippert 6 point jacks. It also fit the lug nuts on my trailer wheels. The breaker bar works great on the wheels.
I then added back ONLY the things I actually used for repairs or things on the actual camper. This down-sized a LOT of crap! And now I have a set of actual working hand tools specific for the camper.
I carry a separate electric drill. It is switchable between normal and impact. I've added thing like that gigantic socket to remove the heating element from the water heater (used only for the camper), a long long time ago I started carrying a separate socket and a wrench SPECIFIC to remove the water heater anode rod. It NEVER leaves the camper as I use it often, and I really had to find a way to improvise a tire jack. I think that was my most innovate idea! I carry a small set of socket with a 1/4 inch socket driver. Nothing elaborate. Simple.
Bottom like, DO NOT take a bunch of stuff simply for the sake of taking it along. Check each item out BEFORE you add it to your collection and make sure it's something you'd actually use on the camper. Otherwise, you are just dragging along a bunch of junk.
I do have quite a collection of zip ties, Robertson Headed RV (brown colored) screws, bolts, nuts, different types of tape, zip ties, wire of different sizes, Command Hooks, .... things like that are more important to have than actual "tools". I also keep extra slide cable kits on hand now, and the tools to install new cable for my slides. Over 5 years, I've broken 7 cables. So, having the extra parts and the tools to fix that IS important to have. But, I have no need to drag along a soldering iron! It seems a screw is always coming loose somewhere, or something needs taped up, or something breaks.
Socket for the Anode Rod (water heater), never leaves the camper:
Here's my tire jack:
There are some other "tools" I carry along. Like I said, it took 30 years of fine tune what I actually WOULD and DO use in the camper opposed to what I "THINK" I might use an MIGHT need for a "what if" moment.
For the "what if" moments, those are unpredictable. Chances are, if a "what if" moment happened, you probably can't fix it yourself anyway ... especially while on the road or at a campground!