I went east over Vail Pass and my 34' MH with toad went up the hill at 28 mph it is the first time I have done this is this what I should expect from my 2008 V10 Gasser?
Sounds about right to me? I traded my F350 V10 for the 6.7L diesel. Added 10-15 mph to the Vail Pass speed. Pulling a 30' 5th wheel with a Ford Explorer behind the 5th. V10 speed was similar to what the OP quoted.
Having been over Vail pass and the eisenhower tunnel a few times you could get down to about 25 MPH. I pull it at about 35 MPH and I am pushing the heat up to over 200 by the time I get up it. @ WOT I would overheat so I try to get it in the sweet spot of around 1850 RPM. just sit back and enjoy the ride.