Blackbelt,
Yep, Revell-Monogram produced a set of WWII Ground Equipment that included a tug. It was a Pro-Modeler kit that you might still be able to find online for a reasonable price (around $30--which is about how much it cost when it first came out). I have that and have built the tug; VERY, VERY nice kit, well made, little-to-no flash and very detailed!
I think there are other tug kits out there as well...maybe even resin, if you're into resin kits. If memory serves correctly, I think VP even had a 1/48 tractor, but I could be mistaken. Tamiya has an injection molded one in their Corsair kit with Moto-Tug kit.
Tamiya has also produced the US Army Staff Car in 1/48 by itself (item #32559) for about $30-40, depending where you buy it. I have it in my stash and it looks like an OUTSTANDING kit--can't wait to build it!!!