I had an informal test two weeks ago while going on vacation: The trip was from Vegas to Bridgeport, Ca. The rigs, My friends 06 Mega, all stock except airraid intake and 35" Toyos pulling a 39' Sandpiper 5er. My other friends 08 F-450 crew cab,6. 4, 4x4, 4. 88's, all stock, pulling a 40' Rampage 5er. And my truck, an 07 F-350, crew cab, 6. 0,auto, 10" lift, 38. 5" tires, 4. 88 gears, AFE intake, 5" exhaust and SCT tuner set on towing, and a bunch more stuff that won't help towing ,pulling a 32' bumper pull Weekend Warrior. All the trailers are fiberglass sided, 1 Yamaha Rhino in each, all black ,gray , fresh tanks empty. Both of the 5ers have one bedroom slide out,mine has none. So to summarize, you would think my hopped up F-350 towing a shorter ,lighter trailer would stomp my two other friends, HUH, nope! The 06 Cummins SMOKED! both of us, by a long shot, dissappeared, gone, BYE BYE! I outpulled the F-450 on the hills, but again, his trailer is much larger and I think the 4. 88's hurt him with little tires. No doubt, he probably could tow that thing all day every day and be happy. Anyhow, I think it's clear the Cummins is stronger and more reliable that the competition, but you have to get what suits you, which is why I don't have my Mega anymore, I needed a long bed and wasn't gonna buy a Chevy. My wifes Excursion 6. 0 is getting long in the tooth, if Dodge would hurry up with the long bed Mega's, I'll get one.