HAVEN'T TRIED THIS YET, BUT WONDER IF IT WOULD WORK
https://www.ebay.com/itm/2oz-THICK-BLACK-RUBBER-TOUGHENED-CA-Cyanoacrylate-Super-Glue-2oz-ACTIVATOR-PKG/262265015357?epid=1168772309&hash=item3d10368c3d:g:1h4AAOxyuOtRbFDf:rk:2:pf:0
https://www.ebay.com/itm/Vintage-1-25-Built-Dodge-Truck-and-Jeep-for-Parts/263966959126?hash=item3d75a82616:g:OHEAAOSwcbRbsYEl
https://www.ebay.com/itm/Group-of-Model-Pickup-Truck-Parts-MPC-Dodge/202450477440?hash=item2f22fd2180:g:vYMAAOSwjtZbrDoO
I THINK TM RESINS CAST A FLEETSIDE SHORTBED