Pelican, Plano, Apache all seem to work. Don't have any myself but since friends with jeeps manhandle their respective cases and everything seems to be working out well aside from cosmetics.
Just be sure to get closed cell foam to keep moisture out, and some silicone packets to aid the case in...
If you're not using it, I'd say trade for something you will use. Sounds like you've mulled on this a while and you've got things that cover all your needs
Will be a pain in the neck to set up initially but I'd say see about TurboTax. 1040s and a Schedule C aren't too bad, the depreciation isn't difficult either once it's set up (keep an excel table once you're sure it's right for each asset).
And if you're still not comfortable move onto a...
Cost cutting leads to poorer maintenance. Companies need competition to make improvements and that's not something that's happened in quite a while in the rail industry.