So let me say that again as I think you missed what I was saying ....
You have (using your gut feeling) engineered "front recovery points on your 90 using steel tubes welded through the chassis that have 3/8 BSW high tensile bolts going through them and 10mm thick side plates that are welded to a 12mm EN16T cross bar that is placed through holes in said plates with a yoke between the two for front pulling" ... on a standard 2.5mm mild steel box section chassis.
So these plates, tubes and the cross bar are where exactly ?
Above the dumbirons in front of the forward cross-member between the forward chassis legs or between the dumbirons, effectively bracing them together below the chassis ?
Stengthening that area surely exposes the area behind the forward x-brace (where the 4 holes are before the front spring retainers and shock turrets) as being the next weak point ?
Or do your additional 10mm plates extend past then towards the engine mounts where the chassis offers a taller profile section.just in front of the gearbox x-member ?
You are right in saying that the chassis (even the standard chassis as in the pic) shouldn't give way before the shackles break (ie they are the weak point) but what shackles are you using ?
Earlier you said you used 5/8" 3.25T WWL shackles. These are rated with a 5 (or 6):1 safety factor. 5:1 = 16 tonne.
You also said you used 6 and 10 tonne 'towing' straps.
Why have you added all of this additional strengthening again ?
My point is that all this strengthening you have added will hold fast but the chassis 'will' tear in half as it is weaker ....
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