Frame damage or design? 92K1500 Long bed

[Flatcap]

To cut a long story short, my truck needs a bit of frame welding to pass it's UK annual test so decided to do it properly and remove the bed, fuel tank etc to do both the repair and whilst at it, descale the frame & treat the rust etc etc.
Now...I nearly had a heart attack when looking at the frame as it's definitely "different" so to speak! The drivers side rear chassis rail bends inwards towards the pumpkin whilst the passenger side looks as one would expect, reasonably straight & true. Do I have reason to be worried or "fingers crossed", were they designed like this?
The dampers are true & upright and there is no evidence of frame damage with the bed fitting well onto the frame. Hopefully you guys could offer your thoughts. Photo's to illustrate:

 

[GoToGuy]

Where are the cross members?
In the engine section, there is a sticky for the OE service manuals for your year truck. Covers all aspects of repair. Including frame specifications, repair service.
The PDF 's are free , the OE " bible " for repair and service.

 

[Caman96]

Looks same to me, but I’m not there.
As mentioned, do you have cross members?

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[b454rat]

i've never notice that!! But i'd say it's OK. Other than lack of crossmembers, the spring hanger is still there, and the spring is still bolted to the axle, so, it aint going anywhere.

 

[Sean Buick 76]

Is there a crossmember between the t bar cross member and the rear? Mine was riveted in. A frame shop would be my next stop you need to get things all aligned and strong. No use beefing it up it it’s crooked. It looks crooked

 

[Caman96]

Is there a crossmember between the t bar cross member and the rear? Mine was riveted in. A frame shop would be my next stop you need to get things all aligned and strong. No use beefing it up it it’s crooked. It looks crooked

They do taper in from fuel tank cross member. Thank you @SNCTMPL

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[454cid]

Did you remove the cross member that looks like like a stretched X?

 

[Sean Buick 76]

They do taper in from fuel tank cross member. Thank you @SNCTMPL

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Yes they do taper

 

[Flatcap]

Well all you guys have put my mind at rest, more or less ! Thanks a ton for the measurements Sean Buick, most appreciated. It's a bit disturbing that their is no rear x cross member and cannot fathom why a previous owner may have removed it. Shipping one over from the States isn't an option due to the rediculous shipping costs so may have to look into a homebrew version. It least there is the beefy tow bar in place to aid rigidity. It's had multiple owners including someone in Belgium before being taken to the UK so who knows what happened. Thanks once again boys

 

[Flatcap]

Just remembered, I removed two lpg gas tanks from the truck sometime back which probably explains the absence of the X cross member. It had a European gas filler fitting (different from UK type) so pretty sure the lpg installation was done in Belgium with the cross member removed to make space. I removed all the lpg equipment to take it back to stock.