The do look nice, but I agree with Aaron: the bases need to be bigger. Then you need to beat the heck out of them! What did you need 2 cases of caulk for?
There are some great models in this thread. All are very well done.
I have several pickups in the stash, but this is the only one I have completed so far:
1925 Ford Model T (looking a lot like A.J.'s)