School me on truck frames- do they twist?

some twisting is good it makes truck more flexible on terrain and use less tires but not while unloading.....

interesting is too see militarised trucks , with extra long wheelbases and similar things

NL army have suspension on 3 point on container locks on thier scanias , mercedes offer 32xx 8x8 only for defence with 8mm frame for better flexibility

here is irish army r420 6x6 on test



http://www.scania.com/_system/img/highres/75077_highres_08444-006_tcm10-206991.jpg

 

as I know doble frame is better the double thick frame.

I've seen cold war missle trucktors (generally MAZ 537) with very strong frame. But I'd say they cant be used with commercial trailers (3.5" kingpin fifth wheel).

Fortunatly there are highways with good pavemet we use to ride)))

 

It's fun watching some of the HEMTT's get off road and the twisting you can do with them things too.....

http://www.oshkoshdefense.com/heavy-tactical-vehicles



this was one of the vehicles I got to operate.

View attachment 31969

 

about tactical trucks.....: Oshkosh is the kind of truck you can use on public roads with some limits. Russian tactical trucks were of two main families: normal size (not wider 2.6m and not higher 4m) and of enlarged size. But there were no wider 3.5 m trucktors, becouse USSR was agressive country ready to ocupy Europe, and they made trucks for european public roads

 

dont weld it use screws . welding is big problem it is not flexible enough and most probably it will cause cracking at weld

some years ago we used "teeth" here but now only screws

 

A company here in Montana where I live quoted me $5000 for r&r on one rail , meaning $10,000 for both new frame rails. At the time I was thinking along some different lines than what you are wanting to do but none the less that gives you a jumping off point. That was a couple years ago, but bottom line here is if 2 new rails installed is around $10,000 give or take a few then one should not have to pay any more than around 6 or $7000 for a good quality stretch, turn key out the door go run with it. Just some round about numbers here, you may want to get several more quotes to see what kind of variation there is, know what you want when calling these guys. Hope that helps some, J-J

 

Sounds very expensive !

 

Sounds like a single axle setup would serve your needs. How much are you stretching it?

 

As far as where to cut the frame let the pros tell you the best place, experiance plays a big role here. Depending on how the weight is distributed at 35k I think you will be over on your drive if the steer is maxxed at 12k, that leaves 23k for a single axle far as I know they only allow 20k on any one axle. As far as the double frame thing, they can tell you that but ask the questions all of them, I have not seen a stretch frame that is done right doubled. Just remember that a quality experienced shop that does this kind of work all the time will know exactly what to do, anymore they can not screw up because of the liability involved. Good questions though, let us know what you come up with.
J-J