It sounds like Cat1234 has the closest to my distilled minimum setup. I add a few six point sockets for those “fun” fasteners, stop at ¾’s with my combinations and angle wrenches, add a Craftsman Ignition wrench set (wonderful little kit, relatively cheap too), lacing cord (cold and hot, err, I mean Type 1 waxed and Type 4), permanent marker pen for panels and cargo pit liner etc, metric adjustable, speed handle, 032 and 025 stainless lockwire (yeah, we are one of the Neanderthal organizations that uses SS on electrical connector safeties), a small spool of break-away wire, wire strippers (since I mainly handle avionics now), needle nose vise grips, and curved jaw Channel Lock pliers for electrical connectors. With the appropriate additional tools for a special job, this tray full of tools can take care of tire, actuators, engine changes, etc.
Maybe you can understand why my arms keep getting longer. Isn’t the Snap-On ratcheting bit driver the cat’s pajamas?
Of course, I am always wondering if I am overlooking something, or if anyone has a suggestion on what to leave out. Keep the comments coming. Who knows what we may learn.