+1 for this type of truck.We haul a mix of circular straw bosses, their three-legged stands and a couple of wooden framed foam bosses out onto our field every week plus a host of ancillaries (metal detector, shooting line, etc).
We have a heavy duty turntable trolley for this purpose similar to this:
Heavy Duty Turntable Truck TSK100SC
and it does the job really well - a 2 person job in the winter on a muddy field but much easier when it hardens up underfoot.
Karl