I do all of my wrenching at home with the tools I take on the road (so I don't wrench out of a massive tool chest that has everything). This way I know what tools I require for each specific task and can eliminate unwanted tools.
Having said that, my road tool collection is, ahem, "comprehensive". I also carry all the tools required to fix any issues on the trailer as well as other 'ski's. I have a Pelican case in which to carry all my spares. Spares themselves are each stored in their own dedicated storage container which are all bundled into the big case.
Having been involved in motorsports for over 35 years has taught me you can never have enough spares and the tools to install them