I believe that QTR still have the Trader and TK on the rally scene but I haven’t ever seen the Commer. I had it in my addled mind that the TK they replaced the FJ with in the 60’s was a long wheelbase version (I know that preserved one isn’t the original one anyway) but I might be getting confused with the company ‘Allsigns’ of Ascot, who we also dealt with, as they did buy a longwheelbase version fitted with a coach rear axle at about the same time that replaced a BMC WFK 5 tonner? 
Pete.