An update to this thread. The major change to my rig for this trip is a new Husky Centerline TS 32218 WDH with 1200 lb bars. This upgrade from my old EZ Lift 1000 lb round bar w/dual friction bars setup made a massive difference.
I did 900 miles of towing this week, about 16 hours driving, averaged about 8.7 MPG during a Portland OR to Eureka CA round-trip. I5, 199, and 101, with a wide variety of road conditions and speeds. 65 on the freeway with some long hills, weaving through the redwoods at 30 MPH on narrow, chewed up 199/101 with quite a few 6 & 7% climbs/descents, and high winds along the coast on 101 South.
Weights were pretty much as usual - ~3300 on the front, ~4500 on the rear axle, ~7700 GVW, trailer at about 7800 lbs from 4 people, 3 dogs, with the toy hauler lightly loaded. So around 15,500 lbs total. The truck tows this load beautifully, never lacking power, almost always in the right gear (T/H Mode with 10th and sometimes 9th locked out), with a quiet, comfortable ride. The big difference this trip was due to the new WDH. Stability was much better - I had zero push/suck when passing or being passed, and in the high winds along the coast (40 MPH broadside from my right) even though I could feel the gusts hit, she tracked very true. In addition, the bobbing effect I noticed in the front suspension before, from dips or big bumps, is greatly reduced. Never a white knuckle moment regardless of speed, traffic, or road conditions.
I think I will do a set of Rancho 9000s on the front and a 5* tow tune this summer and that will be it for mods. I'm very happy with this truck. It is an excellent tow vehicle and I can't think of another 1/2 ton truck that would be as good.
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Mike
2018 F150 Lariat SCREW HDPP, 3.5EB, 6.5' bed.