Well, based on a perusal of available trailer kits and a lot of guess work, I'd say those are a mix of Sd.Anh.32 and Sd.Ah.53 cargo trailers. It's also possible that they're field kitchens. It's not easy to tell from the grainy pics, and I'd be the first to admit I'm far from an expert on the subject, but those appear to be reasonable guesses. Hopefully someone with more knowledge will pop up to give you a more definitive answer.