Update: On Wednesday, I took and passed my Class B non commercial license for my DP.
It went pretty well except the usual challenges at DMV with paperwork (bring in your registration and insurance card - I had to run back out). I had also parked my DP on a side-street and they wanted me to move it closer to the building (didn't fit in parking lot) so they had me park along the street near the building in front of the No Parking signs (Really?, You want me to park in a no parking zone in front of the DMV?
) Needless to say, I had DW stay with it.
Otherwise the guy who drove with me was very knowledgeable about DMZ licenses and policies. I didn't even have to do the Air Brake test as he said that is not necessary on non-commercial vehicles, although he did review it with DW and I. (I was ready to do the test).
He also was VERY excited about driving in the RV and even took a picture of it afterward! He joked with his peers before the drive that he was going to give a driver test in an motor home and wouldn't be back for a week. I got the feeling they don't get to do this very often.
Otherwise, I was more worried that I needed to be. And although they did not ask how I got there, I had already said the guy with me was a fireman... But this instructor might have asked.
Hope this helps.
PM me if you have any questions.