Flexible gear trolley makes light work
I can relate to having to haul lots of equipment round, I thought I'd got it down to a fine art till I saw this superb construction from Groovegear(sp).
The V-Cart Solo gives you plenty of ways to make light work of your massive bass rig or drum kit or, ahem, over-complicated video rig.
Configurable into three distinct formats, it's going to give your back a break and folds nicely into something small enough to fit in the trunk - or boot as we English quaintly call it.