We have a fold-up wheelbarrow on our communal plot which I use for ferrying stuff to and from me lotty which is the furthest point away from the road so quite a treck. Like you I can't carry everything so have found it useful. Trouble is it's not very good, a bit flimsy, and it tends to come apart! Mind you it was a lotty find so it's not as if it cost us anything. Looks ever so smart though - it's tartan. When we did our lotty open day my arty niece filled it stylishly with veggies - it looked fantastic ;D Anyway I digress! Get yourself one, they're not that dear and like you say you can chuck it in the boot :)