Please be more specific about your truck. What is it? Has it been modified, etc.?
Why does this site often upload pics in the wrong orientation? Does anyone know? I see it and have experienced it often. This is one of the reasons I've posted more build pics on another format. This site can be a PITA to make it look good.
Also need to know how much weight is over the rear axel. The range of tyres for truck below 4.5t is far wider than above.