Byronic
Guest
Different make MH (2009) but I needed a towbar as we need to pull a box trailer to motocross meetings. My Fiat chassis stopped well short of the rear of the vehicle. I had to get it custom made - chassis extenders and a full length rear bar which the tow ball bolts on to. The company attached a metal plate with date, reg no, towing capacity, and some other code nos. Real professional job. Wouldn't have even considered doing it my self - visions of the box trailer going in a different direction down the motorway. The rails obviously provide extra support for the floor but presume that wasn't really needed as the MH company would have done this when it was built otherwise. I had it MOTd a few weeks ago with no advisories. Bob
Which means that the company were willing to stand by their
workmanship and knowledge. Good enough.
After all there's no way they could apply actual calculations or test to failure point all or any of the custom jobs they may carry out.
At the end of the day the empirical method with a safety margin (FOS) carried out by an experienced firm is
likely the only option on some M/homes.
The equivalent of the VHM (as my post #?) is what they could resort to, just to make as certain as they can of any strength and safety issues.
Just as an exercise I calculated the steel section dims. needed for the frame
for my rear rack, but had to take an educated guess on what
the actual Merc. chassis cantilever legs could take, because (a) the strange shape and (b) what was the pre-existing load on the legs from the body and interior fittings plus carried gear eg gas bottles.
So although my rack is strong enough, am I sure my chassis is, other than by the VHM
method?