Cassp... have you considered the possibility of getting yourself a musical partner, a guitarist, a sax player, something like that? On the one hand, you gain a different musical perspective on the material (hopefully a good thing ), and an influx of new material that perhaps you might not have considered, you gain an instrument that, no matter HOW hard they try, arrangers have great difficulty emulating well, and you hopefully gain a second singing voice, better than artificial harmonies, and maybe perhaps even a better singing lead voice than your own, but also, on the other hand, you also gain a partner that can assist you in lifting some of the heavier items you carry...

A burden shared is a burden halved...

Personally, I have little trouble moving my own equipment, but the addition of a MUSICAL partner has that additional benefit, and I certainly don't mind the help! But primarily, having an additional musical input helps me enjoy my gigs, adds an element of surprise (you never know EXACTLY what they are going to play, unlike an arranger) and challenge.

I know it's a BIT harder to find gigs for two as it is for one, but OTOH, in today's economy, smaller outfits (but larger than OMB) are a growth area.

Before you commit lots of money to simply making moving easier (and lose out on the sound and OS you prefer), consider the ADDITION of something to your act, rather than the removal....