I pull a North Trail 28 BRS with a 5.0L s.crew 4X4 short bed with 3:73 gears. I was getting 14mpg in mild hills and the truck was barely working. It didn't sound or tack much higher then no trailer. I thought the Eco boost with toe package was good for 11,300 lbs towing. Mine is only good for 9,300lbs as equipped.
The guy behind me pulls a large multi-slide SOB fiver with a platinum Eco-boost and says no problem. Some weekends I'd see a cummins ram there, not sure if it was his too.
I see half tons bringing fivers at my CG every weekend and they do fine but like you said. Load in 3 kids, DW, a mastiff, yourself, gear, and a tank of gas and she's really loaded once the tongue weight is put on it.
If your WD hitch is setup correctly the truck and trailer should both sit level. You shouldn't need air bags or helpers with a WD hitch. Every one I've set up had that in the manual. If it doesn't sit right, it's not setup right. Any dolphin or bucking is from an improper setup. A slight adjustment to the ball angle can increase or decrease this. Same with the number of chain links showing. Changing TV or TT contents may require another adjustment.
Good luck and keep it greasy side (or corroplast) down.
Sent from my iPhone using
Tapatalk