COE Ramp Truck EP – 10 Cab Mount FABRICATION / INSTALL

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The fact that the engine is completely exposed out the back makes the tilting body pointless.

If you open the doors it help with getting the cab up and down

DUDES! Some bump-stop receivers somewhere else other than that latch on the cab would help spread the load and impact – not just from the cab slamming back down but when you are out cruising over the obligatory pot-holes!

I'd think about redoing the steering arm bracket so that the Heim joint is in double shear – i.e. the bracket is a 'U' with the joint sandwiched in between. When you design a steering arm you really have to worry about fatigue failures caused by the bending moment on the joint.

With a standard automotive ball joint the bending moment is taken by the taper and the fastener operates pretty much in pure tension; of course this means you have to make a tight fitting taper which is not so easy for your average fabricator. With the Heim joint there is some bending moment but having it in double shear reduces the cycles to a negligible amount.
 
This is a place where brute force and ignorance doesn't apply – especially when you have a full load going down the highway i.e. Murphy's law. If you under design the bracket then it will most likely bend before it breaks giving you ample warning with a change in steering geometry. With a bolt in single shear the bolt will simply break and you lose all steering.

I'd recommend getting a copy of Carroll Smith's Engineer to Win – probably the best book on the subject and he talks a lot about steering geometry. 
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Is the back of the cab going to continue to buckle during normal driving or is there a landing point on the right and left sides? Troubleshooting is the best part of the build.

It still looked a bit low at the rear to my eye but I am looking at a phone.

Wouldn't adding some landing pads on the rear cab corners help distribute the load of the cab, instead of placing all the weight on the center?

Nice to see progress on this unique and beautiful truck !

I'm a bit surprised by the cabin latch attachement though: quite sturdy tube on one side, taking the load straight , and on the other side now a comparatively flimsy tube already bent taking the load with a leverage… I guess you don't plan to crash with this, but even driving on potholes may take a toll on the cab holding structure (depending on who's on the passenger side I guess).