Never mind, the camper now fits.

[Slate]

   I worked for an RV dealer and have replaced the roof and AC units on a few. We have some low bridges here in NJ too. 

[MiloMorai]

You find bridges like that scattered all over Chicago. You can't trust the clearance signs, either. Most are off by 1 foot (for snow), but not all of them.

I clipped a bridge in Calgary, AB while bobtailing. The sign was in meters and while I was trying to do the math my stacks hit the bridge. Good thing I didn't have a trailer.

How hard is it to multiply by 3 and add 2 ft to the result or have a sticker in the cab giving the hight of the vehicle in meters?

[Babalonian]

How hard is it to multiply by 3 and add 2 ft to the result or have a sticker in the cab giving the hight of the vehicle in meters?

The man is a licensed vehicular freight transportation specialist, not a doctor.   

[rpm]

How hard is it to multiply by 3 and add 2 ft to the result or have a sticker in the cab giving the hight of the vehicle in meters?

Harder than putting the sign in feet and inches.