My first call would be to your local HD asking them if you take ownership of said truck would they extend the license to your company. I looked into it here and was told absolutely not but they would work with me if the current owner would bring the truck to them for inspection.
I found that most of the older trucks here in Southern California are not to code and were grandfathered in when the laws changed. This is why a lot of them are leased from the commissary's since they have owned them for so long. The truck you are looking at has several of the features they require here so you may be ok especially since it is in current operation.
Another question for the HD is do they require the vehicle to be parked at a commissary or commercial location? Here in CA they do which was a deal breaker for me. They also want the cooker to be NSF certified, again a deal breaker as the cooker I planned on towing behind the truck was not.
I do wish you the best of luck and hope this truck works out!
Horizon Patriot grill, Kuma Platinum SE, UDS, Weber Spirit E-310, Mak 1-star (on the way)