[We need a little silly now and then, right?]
Bella ends up with an SUV that can withstand a freaking missile attack.
I roll to disbelieve.
Clearly what happened is that the chameleon circuit on her truck was unintentionally activated and made it look like an SUV and all of the scenes with the SUV are like if there were scenes where the TARDIS is accidentally stuck in the form of a refrigerator box. The Doctor might not appear to be upset, and he might go on with his life, but you know that on the inside he's desperately trying to figure out how to turn the TARDIS' exterior back into a blue box, because every second that goes by while it's a cardboard refrigerator box instead of a wooden police box is bringing him that much closer to losing his cool.