I think my allotment transport has featured on the forum already. However, as you're asking:
I have a shed on the allotment, so for everyday collecting harvest from, and taking compostable stuff to (Usually including a run to the bottle banks too)
For water during droughts:
For large loads - Hossmuck, rotovator, sacks of tatties etc:
Luckily my allotment is less than a mile away.