How tall is my rig

Cardinal what? Fifth wheel will list 13'6" in the brochure. TT? Anybodies guess.

Height is very important. I have it on my dash in US and metric.
I acheived the measurement by using a straight 2X4 with a level attached. One end on the high point, air conditioner in my case. I attached a measuring tape to the off rig end. My helper, wife, read the measurement to the ground.
I added a few inches for clearance.
In the case of a trailer, you will want to insure the tanks are empty. Spring compression can effect height.
Your high point could be the front vent.

Height is very important and you must measure it yourself; don't want to take the top off on some old RR bridge.

I have a trailer shed, so I measured the height to the ceiling, then climbed on top and measured the distance from the top of my highest AC to the ceiling. Subtract and found 13' 1".

You can try to measure from floor to top of highest point, but difficult as it is probably an AC, and you must have a level to measure accurately from the AC top out to the edge of the trailer. If you have no shed, I'd say; pick highest point, measure height to top of trailer at that point, then add distance AC rises above trailer top.

I always allow 3" on measurement errors (mostly theirs); ie if the bridge is only 2" higher than my calculated height, I won't go under it.

This is one thing I don't have to worry about with my low height setup haha...

I used to see something on the Interstates that measured your height as you drove under it and it would flash how tall you was... Don't remember where that was at. Actually after thinking abut this it didn't tell how high you but did flash a warning light at you if you was too tall which is 13-foot something I think...

I reckon the best way to know for sure is use the tape measure...

I might drag a couple of my Ham Radio antennas going through a McDonalds Drive through but that's about it...

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Roy Ken

Hubby did something like that he measured from the roof to the ground, then from roof to the top of highest A/c unit then added the 2 numbers

Go up on top with your tape measure, check at the highest point the distance to the ground.