Goose, I know for a fact that you will have a hell of a time trying to find a jeep. The only ones that exist are expensive resins kits and OOP bandai kits.
If your looking for 1/48 scale you are in luck!
Tamiya’s (and soon others) are releasing many vehicles in 1/48th, amoung those out now are the ever present jeeps. . .that said, Monogram used to have the tracked tow vehicle in the B24 kit.
As for vehicles used to actually tow the aircraft, being a former enlisted in aviation, I would venture to say that if it rolled and could tow it was used. Remember too, this was war time and if it could be scrounged up and made to work it would be used! And if there was nothing to use vehicle wise, the crew may very well push it! How about a team of horses from the local farmer!
I have seen a picture of an unused B24 nose turret mounted to a jeep for use as a control vehicle, sans machine guns of course!
Check the web and then scour the catalogs, You may have to scratch something to cobble together a vehicle, much like the real crews did.