Dromedaries and length limit

I've been reading up on federal rules and if I'm understanding correctly, a tractor/semitrailer combo on the national network and reasonable access routes cannot be limited in overall length by any state.

Importantly, in the section on dromedaries, the federal language says it's up to each individual state to decide whether a given vehicle is a tractor with a dromedary or a straight truck.

I'm looking to build a tractor with dromedary and I can't find a lot of information about this.

Thanks.
Federal Size Regulations for Commercial Motor Vehicles - FHWA

 

Is this all moot if I have to leave the national network to get to a job? Say I jump off I-95 and drive down a smaller state road for eight miles and I'm not on the NN anymore. Is there an enforcement guy on earth that will care if my vehicle is 67 feet instead of 65 feet?

Another question, is 65 feet overall for a dromedary tractor pulling a semi trailer good for every state, even off the national network? Or are some states super strict on length?

Trying to figure out a setup that will be legal just about everywhere. Thanks!

 

I'm looking at building a crew cab tractor with dromedary deck. Purpose is for interstate construction work pulling various job trailers. We'll stay at motor inns if we have the trailer hitched and wherever we want once we drop it at the job. So no sleeper required. Need basic tools on the truck at all times and ability to grab a couple things at the lumber yard or whatever. Here's a screen grab of the truck I am building through International. This is a 6x6. Thinking an 18 speed but I don't know if I want to lose the bench seat. No quote yet, I'm guessing 220k. Is that way off?. Ignore the stake body that was just a placeholder.

This truck is 107" BBC. I had originally wanted a two foot drom box with drawers immediately behind cab for everybody's luggage, plus a six and a half foot drom deck. A 6'6" drom deck allows me to mount a box like this one:
... and still have room to pickup a four foot long pallet. That box is 30" deep. Box provides everyday tool storage for crew.

Anway, figuring I need 60" for trailer swing, then for a 24" kingpin setback I would burn another 36" of overall length. Converted to feet that's 68'5" and that's with a 48' trailer with a 2' kingpin setback.

(I'm currently shooting for 65' overall to drive wherever I want but if that's a mistake please let me know).

So I guess I need to get back 2'5", call it 2'6". I guess luggage could go on a rack, although I was hoping to leave rack space free for miscellaneous materials. Anyway that saves 2'. Then I can do a six foot drom deck and that would put me right about 65' with a 2' kingpin setback and a 48' trailer. I'd probably have to build a custom 2' deep box to store all the tools I want and still have 4' of drom deck available.

Have I made any mistakes with my thinking here? Can I drive wherever I want at 65'? Thank you.

 

Thanks. That makes sense. If I’m on the big road, I’m probably on the NN and I’m legal. If I’m on the little road… well, if a tree falls in the woods and nobody’s around does it make any noise…

 

Yeah that’s a good idea. I guess I was trying to maximize cargo space but it’s good to know I could just go smaller on the trailer.