The M10 Ammuntition trailer was widly used by US & French forces in ww2 for carrying ammunition and was towed by M7 Priest, M4 105mm Shermans, M8 HMC’s, as well as trucks.
Most pictures of USA s.p. guns show them towing this or the earlier trailer.
It was made from 1942 until 1945 and was armoured.
There are 2 styles, a non covered crated one and a cammo netted one.