hey guys. i'm thinking About upgrading to a diesel next season. right now i have a 2003 Sierra with the 5.3 liter engine, K&N FIPK, Flowmaster and i recently programmed it. i programmed it to make it shift harder for pulling but i did all the other stuff for fun WAY before i even thought about running a lawn service. im pulling an 18x6 tandem open trailer with a rear gate and side gate, exmark HP and XS mowers, 3 blowers, 1 push mower, 3 trimmers and a toolbox. my thing is..... it pulls just fine... especially with the programmer, but i'd like to be able to pull my rig without feeling like im pulling anything. id also be able to take off in heavy traffic better when pulling. my truck didnt come with a towing package (trans coolers, hitch... etc) and if i keep this truck i'll put the trans coolers on it next season. but judging by how my business does next season, i'm thinking of upgrading to a diesel anyway. i want either a duramax or a cummins. i love the looks of the fords but i'm staying away from powerstroke cuz of horror stories that i'm hearing with blown intake manifolds, gaskets and finding shavings in the oil at 1500 to 8500 miles. i've always been a GM man when it comes to gas engines but i'm not sure about the duramax. i've read where it's a little bit superior to the cummins when it comes to automatics but the cummins takes it in the manuals. also the cummins is really the only true diesel engine with its inline 6 cylinder. also... i havent heard anything bad about them except that they are wrapped in a dodge. i've never been a fan of dodge but im seriously taking them into consideration after riding in my buddies 2002 duelly (spelling?) and pulling a 20 foot trailer with a tractor with bush hog on it. plus i love the looks of the dodges compared to the 2007 chevy front ends.... YUCK!!!!! either one i get will come with the allison transmission.... so it's the engine i'm worried about. anyway... your input will be appreciated and taken into consideration when i shop around. THANKS GUYS!!