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For the 20th time - yes, C-channel frames are highly preferable in the heavy truck chassis world, because it's easier to upfit. For this reason, I predict they'll NEVER go boxed frame. In my previous post, I showed just how strong a Class 8 frame is. So just because a Kenworth's C-channel frame...

You still didn't answer my question - what model year GM failed at your job site? Was post-2011 with the boxed frames? If so, what was the failure? Fatigue (highly doubt a new truck would fatigue out so soon), corrosion, overload, shock load? Was the GM frame weak at one time? Totally possible...

What year were the GMs and Dodges? GM started using 60ksi steel in 2011, and Ram started with 50 ksi in 2013. If your fleet is older, the argument becomes a moot point. Ford is the only one stuck at 36ksi since late-90's. Everything is relative, especially in an uncontrolled test environment...

Cost and ease of production? You may want to look up how much more it takes to hydroform a boxed frame... So what you're claiming is two of the world's most capable military light trucks is using boxed frame, with through-through tube cross members, because a snake oil salesman fooled multiple...

Not necessarily. A lot of people buy Jeeps (and Land Rovers) strictly for the image. Not saying that wasn't the case with Broncos back in the day - it could've been. Just not today because the general public has very limited knowledge on what a "Bronco" is.

That was never in question. What was in question is the current SD being flexy AND weak.

No, why did you feel that way? What I am implying, is that the Hilux frame has a greater section modulus per unit weight than a 2015 SD. Once we know the yield strength of its steel, we can also conclude if it's stronger (per unit weight) Of course, and you would know that if you actually...

Fair enough, the FJ40/60 is open past the rear axle, but those regions don't affect rigidity. But do you really feel Toyota boxed the middle section, and the entire length 80 series on-wards, strictly for marketing?

The Land Cruiser engineer must have overdosed on koolaid; he's been boxing frames since the 70's...

Just so we're talking about the same thing - when I say motor coach, I'm referring to REAL coaches like MCI, Prevost, Volvo, Setra, Van Hool, and old Eagles, not RV coaches like Dutchman, Thor, etc. Other than a few million $ RVs built to real coach standards (Newells), these two are vastly...

Can you find any examples of cracked boxed frame? (except for corroded Toyota frames) Number one rule for chassis engineering is to design flex, damping, and compliance into the SUSPENSION, not chassis/frame. It's next to impossible to accurately predict the dynamic behavior of a flexible frame...

Well, here's a photo: By comparison, here's a 1st gen 4runner frame from the same angle: Now, if only Mercedes knew where to stop going crazy: take their frame and axles, slap on a Chevy 6.0 with HD 6L90 transmission, it'll be the most bullet proof and reliable truck ever...

I'm curious what your research will turn up. I've got an even crazier idea of my own. Similar to yours, but larger in scale: And with a Smart car:

Oh for sure, they had tons of charisma, problem is, just like say, a Datsun 280z, only a handful of enthusiasts remember them for their heyday. Whereas everyone, young, old, male, female, knows what a Jeep is... (the sportscar version would be a Mustang) A little harsh, but good points made...

Because it's next to impossible up-fit various decks and bodies with a fully boxed frame. Even on chassis that are normally unibody, they must create an artificial open channel "frame" with flanges to bolt on utility bodies:

They've FINALLY gone fully boxed for non-chassis cab applications, about time they caught up!

You're focusing too much on the details of how 1.0g PERFORMANCE SPECs are achieved. Let's make this simple: In a vacuum of space with earth's gravity, on a flat plane, a block of mass is experiencing a 1g lateral acceleration (9.81 m/s^2), exerted at its COG. If that block does not tip, I can...

I was wondering how your rig weighs so much! That's certainly very heavy armored. Is 7500 fully laden with passenger / cargo or curb? I've never driven an LR3, curious if the engine can pull 6th gear with 33" tires at your weight and drag?

BTW, in case anyone didn't know, to correlate the rollover threshold of lateral g-force to angle of tilt, simply take the arcTan aka inverse tan of the angle of tilt. Example, a sedan that can (theoretically) corner 1.5g before rolling, would have a side slope threshold of: tan^-1(1.5) = 56.3...

You misunderstood me. I didn't say all vehicles are capable of hitting 1.0g performance wise, not even close (I'm a Z06 owner btw, and know what 1g+ feels like). What I'm saying is, for most STOCK vehicles, including light trucks, IF they can hit 1g (imaginary skidpad with warm slick tires)...