Kingpin location rearward from front of trailer?

There's no legal distance just whatever works for your application. 36" is a common # for vans. I would think having a lot more than that would make swing an issue with the front of the trailer. If your trailer is narrrow it wouldn't matter in any event.

 

Do you build an RV Van. Here some peple use old refers

 

here in Europe we have 2040mm (6´ and 8 1/3" ) from king pin to front corner legal limit ( it is by ISO 1726) some other countries ( Scandinavian one ) they use other king pin location so their distance from king pin to corner on trailers are about 200mm more than ours

some trailer have two king pin location

anyway you by our law landing gear must be 2300mm from king pin (7.5&#180

also you need at least 7 degrees of "minimum angle of inclination" forward and 6 rear . for low coupling height 5th wheels you need 4 degrees forward and 2.5 on rear

basicly thats it

 

additional thermal insolation will be requrired. We did it with old Lamberett refer, cut windows with nibbler, we purchased railvay car windows (there is a plant in our town) and doors. It is really warm inside, two Webasto Air Top 5000 heaters were more then enought. summer cooling was a prblem till we got APU.

 

There is a company out west that uses a very long kingpin setting with 57' long trailers. I think the kingpin is 7' from the front to accommodate the kingpin to trailer axle length laws.

As far as restrictions on this type of combination, I don't think there are any. You have to deal with the individual states the truck and trailer is going to travel in and the restrictions they will impose upon you.Which will be overall length, inner bridge, kingpin to centerline of rear axle or tandem. Also if the tractor and trailer combination is registered as a private coach, you maybe exempt from some or all of these restrictions

 

I'm aware of just ONE state, Maine, who would possibly take issue with the kingpin far back on the trailer, although when I just now looked for it, it seems to apply only to trailers over 48". I believe I read elsewhere some time ago that it applied to any semi trailer... perhaps it has since been changed. It still leaves me shaking my head, asking, WHY?

Title 29-A, sec. 2390, 1J, (2) "(2) The kingpin setback of the semitrailer, measured as the distance from the kingpin to the front of the semitrailer, may not exceed 3 1/2 feet in length"

 

And up here the trailer or load cannot be more than 10 feet ahead of the fifth wheel pin.