somebody elses!

I should imagine that something like a Bedford MK (or TM) would do the job
pretty well. They have sizeable payloads - but you'd need a lot of horses
(or one troll) to generate that much cr*p.

That said, on the assumption that you don't want to share the cabin with
the poop, a single-cab pickup (Hilux, L200, etc.) might be what you need.

Obviously a previous generation Landrover Discovery or Range Rover as they
are a big bag of poop to begin with !.