wtmtnhiker, your truck is a 5.3, not 5.7, but that is immaterial.
Importantly, it is NOT normal, and I’m trying to recall, I didn’t think they even went in to V4 mode in tow haul.
Regardless, we have a huge fleet of these exact trucks and I just put 100k miles on mine as well as driving a bunch of the others randomly, and the only way I knew they were in V4 mode was seeing it on the dash. 100% not normal to notice it.
Barring getting a solution from your dealer (if I wasn’t clear, they are brushing you off), you can tune out the cylinder drop mode with various programmers. Cost a few hundred bucks for a tuner.
The rest of the running quality issues are also not normal in the least.
You’re getting jerked around by the dealer it seems.
Yes a new Ford 3.5 Ecoboost will blow the doors off the 5.3 LS motor with 6 speed, but I’ve towed up to around 14klbs with the same truck as yours, over the mountain passes here in WA without issue. And it tows 7-8klbs just fine.