My guess is the patent would not go thru. Especially if someone challenged it. In order for ANY patent to be approved, the patent must be applied for prior to ANYONE in the public to see it. So, if he has been driving around with the cage before he applied, the patent would be null and void. Also, with all the exo cages around with hinges for door & stuff, he would have to have something really unique. People have been doing exocages for years, therefore there is prior art.
Not worth the money.