2012 EB F150 XTR 6.5 Maxtow 7700GVWR, 1700# payload and lots of goodies..... 2012 F150 & 2008 Jayco 23FB
The border between Canada & the USA is a typical human creation. It is physically invisible, geographically illogical, militarily indefensible and emotionally inescapable. Hughe Kingsley
I'm towing about 8000# w/3.55's (actually closer to 3.44 since I put 33" tires on).
At 65 mph the truck spends most of it's time in 6th. This past weekend I had about 7200# and on a 9 mile grade of 6-7% it would downshift to 4th and sit right at 2700 rpm and pull like crazy.
2013 Screw, Race Red, XLT trim, Ecoboost, 4x4,
3.55 E-locker, Michelin LTX M/S2 LT275/70R18E tires,
Firestone Air bags in back, Windbag behind the wheel
dragging a 2013 JayFlight 26RKS up and down the Uintas
I'm very happy with my 3.55s towing a 6500 lb travel trailer. Tows great -- easily stays in 6th gear on flat roads and up small inclines. Downshifts to 5th for moderate inclines and usually holds that gear. Only needs 4th for the steepest stuff on the interstate. And it gets good freeway mileage unloaded.
2011 F 150 Screw 5.5 bed EB XLT 4x4
I had an 2013 Lariat SCrew HD Payload + MaxTow 2wd with the 3.73 limited slip that routinely got 18.5mpg cruising the highway at 72mph, about the same as my brothers truck (just like mine except 3.55 maxtow only). Go to 75 and it started to drop pretty fast, but that is a aero problem, not gearing. Towed my 10K fifth wheel in 6th gear at 62mph. It would down shift to fifth to climb hills and maybe 4th once in a while. I would get the 3.73.
A 3.31 Eco will out tow the 5.4 with 3.73 gears all day and also a 5.0 with 3.73 gears. So a 3.73 is always the best towing gear it's often not Needed with the Eco due to the awesome diesel like torque curve
I tow a 29' house trailer 3-4 times a year and do a lot of town/country driving.
I'm a firm believer is having "enuff truck" for your max load. So to tow a 29' TT with an F-150 EcoBoost, you need the HD Payload pkg so you don't exceed the GVWR of your truck when towing.
The HD Payload pkg includes 8,200 pounds GVWR, the 3.73 limited slip rear axle and the max tow pkg (towing mirrors and intregrated trailer brake controller (ITBC)). That's about 500 pounds more GVWR than with the max tow pkg, and 1,000 pounds more GVWR than the standard F-150. No, you cannot have the electronic locking rear axle, and no you cannot have a 5.5' shorty bed with the HD payload pkg. So a SuperCrew will have "Posi-Traction" and the 6.5' bed. That's a shorty in the SuperDuty world, but it's the long bed in an F-150 SuperCrew where the tiny little 5.5' shorty bed is available without the HD Payload pkg.
Dealers don't keep the F-150s with the HD Payload pkg in stock, so you'll probably have to order it and wait 6 to 8 weeks for it to arrive at your dealer's store. So plan ahead.
With the EcoBoost engine, there are no significant disadvantages to the 3.73 axle ratio. Owners report about the same MPG I get with my 3.15 axle ratio, whether towing or unloaded. The limited-slip rear axle works fine after you learn how to use it. I prefer my e-locker rear end, but I've made do with a posi-traction axle for dozens of years.
Grumpy ole man with over 50 years towing experience. 2012 F-150 Lariat SuperCrew EcoBoost, 6.5' bed, Platinum White/tan, Leer 100XQ camper shell, Nomad Joey 196S TT, CarMate 7x14' enclosed cargo trailer, three other utility trailers, plus a retired 2000 Keystone Sprinter 25RKS 5er we rarely tow now. ProPride hitch on the TT. Reese Strait-Line hitch on the cargo trailer.