First, I'd find the parts/maintenance manuals for your aircraft. From that,
it's easy to identify tools. For example, on a piper cherokee, there are
3 box wrenches that pretty much takes apart the entire aircraft:

two 3/8 in
two 7/16 in
9/16 in (wheel pants)

a good phillips and a good flat head screwdrivers

that's really all I have for short trips. anything longer, I probably
wouldn't be able to fix it anyway.