i used to use a two wheel shopping trolley for transporting my very heavy hard case guitar + hard case squeezebox around festival sites, but two wheels a bit hard going.

i now use a 'baby buggy'. far greater load capacity & easy to push.

i can now give 'lifts' to other muso's cases as well!

at one fest this year, it carried 3 guitars,a mandolin,2 banjos,a bodrhan, & a large african drum + a bag with my 'personal bar' in it all in one go!

its also very handy for transporting heavy water on campsites.