Well I sure as he!! would hope a 5.0 V8 diesel would "smoke" a 3.0 V6 diesel :R As for Ford it should "smoke" the 2.7 EB and as you stated run with or outrun the 3.5 EB.
Not sure why people can't or won't understand, the Ecodiesel was not intended for towing a heavy RV. It was meant for fuel economy and towing a small RV or a boat. Nothing more, there are a few guys over at the Ecodiesel site that say they are pulling 32' RV's in the 9,000# range that is about 1800# over it's rating. I sure as heck would not do it, weight should not be an issue but 32' of RV is to much for any standard half ton truck or any sUV IMO.
I can tell you first hand my Ram Ecodiesel is no slug off the line like a few members would like people to believe. For the first four gears it out ran a F-150 EB but then he walked by right by me after that LOL.
Don