I use the Cabelas back rack drop basket. Works excellent, carries three 6 gallon buckets. Have hauled a deer across it, 5 bags of carrots when legal and the nice thing is when you don't want it on the BACK DROP part comes off with 4 bolts/nuts.
Can't see real well in the picture but it was surely worth the money. Seen too many of the hoop ones fail and/or get bent up or bounce buckets out etc. Drop basket was around $200 after shipping from Cabelas on line, its also in their big catalog.