What is true difference in towing capacity for '03 Expedition with 4.6L vs. 5.4L engines (for 4x2 models)? Would I need a weight-distributing hitch (WDH) at lower weights for the 4.6 than the 5.4?
(1) Expedition brochure shows 5000 for 4.6 and 8950 for 5.4.
(2) Ford towing brochure shows several things:
(a) 6,050 for 4.6 and 8,900 for 5.4; and
(b) in another section, 6,000 w/o WDH, and 8,900 w/ WDH, with NO DISTINCTION for different engine sizes. My luck calling Ford for similar clarification in the past was unsuccessful (A: "Please ask Dealer"). Dealer was less than helpful today.
Assuming difference is about 6,000 vs. 8,900, what causes the difference? Is is something besides the 0.8L displacement increase? I have a loaded boat + trailer (towed infrequently) that goes about 6,000 and might want to get the 4.6L to keep from having to spend $2000+ to get the next higher model. Any explanations? Thanks in advance for any help you might have.