OK - need your expert opinions...I need to replace all 6 tires on my 2005 Chev. long bed 3500 dually truck. We pull a very heavy trailer...what do you use? Michelin...what size and load ranges are most suitable...we are also off-road as we are trail riders....Thanks everyone for your opinion!Also - could we go with a taller, wider tire or are we restricted? It has 16" rims.