Oh yeah, I was thinking the same thing about the Batmissile being the progenitor to the Batpod, only sillier since it's got twice as many wheels. I love that they use HUGE tires on these cars, I love super wide tires like those on the Burtonmobile and the front of the Tumbler (the rear wheels are a different thing altogether, they're tractor-style tires). Also, by using the wheels inline on the Batmissile, it makes the missile itself seem sleeker, narrower.
It never occured to me that the tires were huge thick ones, I always assumed they were similar thickness to common car tires. Kind of funny, really. The rigging holding the wheels is so similar to what we ended up with on the Tumbler, making the Batpod like a Batmissile inspired mini-rig.