Finding the 41 foot mark on a 53 foot trailer

Oh goodie. 41 foot rule here in PA and in Maryland(where I'm going tomorrow). Luckily it's a bunch of plastic. Spoons, bowls, plates etc. Cheap throw away stuff so I imagine it'll be around 20k maximum. I'm just trying to figure out the how to adjust tandems to keep them from going over 41 feet and still not break the 34/34 rule if the trailer is loaded heavy and all the way to the back. Don't need anymore tickets. I'm a po' boy lol.

 

Distance is 36 inches if I recall from front of the trailer to the kingpin. Supposedly there's a 48" trailer out there but they're supposed to be rare.

 

so instead of 10 feet to get to 40 feet, it's 9.