[NCNewellfan]

Hi guys
I need some calming advice
I had a company build me a carport with 14 ft as the lowest
Lots of issues with town council initially would not let me put a door on since had to be a carport
When inspected the inspector said no it is a garage and qualifies
So then I asked if I may install a roll up door
So that was approved
The installation team was clearly informed it mut be 13.5
I also saw a picture of the height on a instrument panel in the coach
This morning I was listening to Bradd Pitts and Andrew and he reiterated that the coaches are 13 feet and 6 inches
So suddenly I start wondering and thinking is this new installed door high enough ( I still have not taken possession of my coach in Humble TX ( still in for paint repair) 
Anyway I drove to my new bus carport and see it is 158 inches so so 13 feet 1 inch
Called the installer and asked can we move the stopper at the top up a few inches… they are going to come and see

So the reason for writing is to ask how much can one lower the coach before driving it into the parking space?

If they can get me 4 inches without totally re installing the door and I lower the coach a few inches I should be able to fit in with theoretically 4 inches of clearance

Would that be doable or can one not lower it down too much ( dumping airbags a bit) and drive slowly in?

Newby at this ?