This may seem a bit of  strange question to be asking on a "railway forum",
but does anyone know where i can find the "wheelbase dimensions" for hgv / trucks / lorries, depending on what you prefer to call them.

I am wanting to build a "3 axle" semi-tractor unit (in n gauge) for a heavy haulage set-up (ie abnormal load transporter).

Reuben.

Maybe another option but would be perfectly legit, it's what the Road Haulage industry used. Get a Tank Transporter(Gramodels or similar) for the cab unit and then modify the trailer.

Think this might be what you're after? 

Mammoet Prime Movers

Note that all heavy-haulage tractor units tend to be longer chassis than standard units as they usually either have equipment storage boxes or donkey-engines behind the cab. Also on a 6-wheeler both rear axles would be driven twin-wheel sets rather than the one that normal road haulage units have 


Paul

hi all 

just had a quick look on the web and found these pictures

railway relaited heavy haulage 

http://waggy-glorydays.blogspot.co.uk/2010/12/allelys-heavy-haulage.html

hope these are of some help

dave 

Let me explain in a bit more detail what i am trying to do.

My initial layout was going to be "L shaped" with off-scene storage loops and an intermodal (containers, swap-bodies, road trailers) freight terminal on the scenic section. I brought the "pd-marsh container lifter" for use in the terminal only to discover that the only trucks / trailers available are for containers.

I have therefore altered the layout track plan and time period to depict a "station & freight yard" with separate "factory complex & sidings". This will be circa 1960's thus meaning that the container lifter will be out of place.

However my other interest is "heavy haulage" so i am going to use the container lifter as a load on a heavy transport trailer. While "langley models" do an n scale heavy transport trailer, they do not have a suitable "3 axle semi-tractor", so i am thinking of converting  a "3 axle flatbed" into a semi-tractor.

That is why i asked about the dimensions of a "3 axle semi-tractor".

Sorry for such a long posting, but i hope it all makes sense.

Reuben.

Hi Reuben,
I'm quite clueless when it comes to this sort of thing so apologies in advance if I'm way off what you're describing, but P&D Marsh have introduced a range of tractor units and trailers - two of which can be seen here, two-axle and three-axle at either end:
[smg id=1852]
They actually do two three-axle tractor units, details are on this dedicated website
http://www.nscalemodels.com/products.html
And I noticed the NGS Shop are now stocking these also.  Again, sorry if I've misunderstood 

Regards, Gerry.

Hi  Reuben, 

If your looking for a  60's era three axle heavy haulage truck  then PD Marsh's E11 & E12 Diamond T  truck  trailer will  be a good starting point the diamond T was left here following the war many going into  private heavy haulage hands surviving beyond the 60's

http://www.pdmarshmodels.com/product_list.php?gauge=%27N%27&cat2=%2770%27

Altrnatively look at Gramodels range for ex WD  vechiles you could adapt /use.

http://www.gramodels.co.uk/GRA_Oct2011_Brochure.pdf

Quote from: reuben28 on August 22, 2012, 12:12:54 AM
This will be circa 1960's

Quote from: upnick on August 22, 2012, 11:44:24 AM
If your looking for a  60's era three axle heavy haulage truck