I was thinking about this a lot and I don't think a ground vehicle would be right for my Joeverse Falcon.
I did think about the C-130 that TRU has.. but it's HUGE! I can't see Han using that to quickly pop in and out of a mission dropping off goods(which is how I plan on using him). I do have the CH-46 Helicopter they made, looks kind of like this:
My only issue with it is that it's kind of stocky, or chubby looking. So I'm thinking of using that, then lengthening the fuselage by close to a foot. Might not go that long, but I want to get it close to it's proper 1:18 proportions as I can.
I'll update more as I come up with something.