This is how I have done it and am welcoming comment or suggested improvments.
Its easier on a ute as you dont have to worry about body lifts etc etc.
I simply Ran some 50 x 50 2mm SHS across the bottom of my tray - Its sits a little higher than tray rails to aid clearance of the exhaust and so it rests against the bottom of the checkerplate - This should help stop the SHS bending - not that I expect this to be an issue.
From that I have run 2 x 30 x 30 SHS 3mm vertical supports and 2 feet 160mm long, the feet sit across the outside edge of the coil hat to stop it bending up and bolt through the existing hole in the coil hat with some high tensile nylocked bolts.
In the pics it hasnt been all tacked into position yet.
I lifted the first brake pipe up to clear more area for the foot to contact the coil hat, and beveled the end (when looking from above) so it could run as far along the hat without interfereing with the other brake lines.
I figure with the outeredge of the coil hat supported it will remove the torque on the hat, the torque puts the on the strap designed to hold the hat down under tension- it is that part which gives out and then allows the chassis to crack.
It only took about an hour to knock up and should save money and hassels in the future.
