If you are dead set on buying this truck then i would go to the junk yard find the same model truck chop off its roof and send the new roof and the truck to a good welding shop.
Roof cut off truck.
On the truck i thought i could cut the roof off above the seam and grind off the spot welds.
Truck cutoffs for sale.
Reman and used frame cutoffs including complete tandem axle cutoff assemblies by eaton rockwell meritor freightliner peterbilt kenworth international mack volvo and more.
Another option would be to have a full roll cage installed but this would require a lot of welding and pipe bending.
Find the right cutoff with the right ratio rears suspension capacity and more.
Find a roof from an old crewcab cut it off at the window and door frames in the front and middle and below the rear window at the back.
I would not trust the door latching it was a extended cab.
Make a filler panel for below the window.
Once that s done i was thinking you could turn it over and grind off the spot welds and remove the scap sheet metal to make a nice clean seam that ll match up well with the original cab.
Maybe they could not afford a jeep.