Today I hauled a 4,000 lb flatbed from Tally to P-cola , empty, just for a test I ran with tow-haul at 67 MPH . No problems everything normal . Coming back with 8,000 Lbs of lumber I found that my transmixer would not shift into sixth gear at my loaded speed of 62 mph , tack said 1,700 rpm . Turn off tow haul and I could run at 62 tacking at 1,200 rpm . To me that sounds better , same speed with a large difference in RPM . I have been running like this for many years with three different Rams , First two I traded above three hundred thousand miles .I do not believe that I am hurting these trucks .
As we must keep a log book , going faster will not help as we will "time out " before we can do but one 400 mile RT per day . At sixty two MPH I get real good mileage , going faster does not help me a bit .
As far as more aggressive braking goes , who needs it as I never run aggressively and 99% of the time I am on a rural road , I do not need the interstate highway and do not drive them unless someone has a pistol to my head ! Every driver is different and our needs are different !