Re the amps, and maybe the guitar too -

Several people I know have rigged old golf carts to wheel their bass fiddles around on, and you can pick up pretty good ones at garage sales in my area for 3 to 5 bucks.

Since they're made for rolling on the fairways - oops: we don't get off the paths do we? - they are pretty maneuverable and light weight.

With the golf bag off, you could sit a HSC on the bottom plate and whip a bungee cord around it and be on your way. Most of them fold up too.

With a little mod work, one might also make a pretty good carriage for one or more amps.

The biggest drawback is that you can "park" them and let go. It's pretty tough for someone to make an inconspicuous getaway with a bass fiddle, but a guitar might be another matter. You'd want to keep a close eye, if not always one hand, on the sucker.

John