That's why I am nearly always carrying my rear carry all, with a tool box mounted on the front side of it, between the tractor and carry all, not to mention a PAIR of Kenny's chain boxes on the I match, which is where I carry the Waite tool and other things that aren't chains.....
But you are right, for those who really use the tractors, the plastic tool box just doesn't get it done. I am likely going to add a "Big Tool Rack" as my new carry all soon......While the home made model has served me well, I have learned all of the mistakes I made building it and its limitations based upon design, which the Big Tool Rack cleverly solves..........Yes, it's expensive but it does solve many tool transport needs and does so safely and productively.......After all, if you drop one 2 cycle or battery powered lawn tool and run over or destroy it, you can easily wipe out hundreds of dollars.....