Ute’s are pretty adaptable, you just have to work out what’s best for the load in question.
I carried both kids on the Ute in different configurations. Large one immediately behind rider on a foam pad and small one on purpose built seat at the very rear was fine until the smaller child got a bit bigger. I swapped them round, placing the child seat right behind me and the larger child above the rear axle (with foot pegs) leaning forward, with both holding the same stoker bar. This was stable enough but you eventually get to the point where they become too big. I continued to carry the smaller one until she was about 10, which was totally safe and great fun.
The Ute really did shine as a child / shopping carrier but the kids are 12 and 16 now so it hasn’t been used for a a while.
Have now started bothying, which generally involves lugging 10Kg of coal and kindling along unmade roads and paths. I suspect the Ute will be coming out of retirement and losing the child seat, stoker bar and foot pegs.