This quick and dirty will expand when I get home. I have a 21 Built to Serve 5.7 with 8000 tow capability and 1300 payload. My trailer is 27.3 feet long 5700 lb, 600 lb tongue (dry). I'm 6800 and 810lbs loaded and right at payload running. I went from Helena MT to Spokane WA, 310 miles, two moderate passes.
First impressions. I was running at 72 mph and less on the passes regular traffic, on 10 mile 35/45 mph construction zone. I had 1300 miles on the odometer at start.
First impressions: Mileage 8 mpg calculated 8.6 by lyometer. Plenty of power exceeding expectations even up passes. Not as much as my old 3.92 2015 Outdoorsman and delivers it differently as you can tell the tranny is doing some of the work vs a 3.92. It spent a lot of time in 5th gear some in 6th and a little in 7th. Never saw 8th. Tow haul. Mileage about the same as the 3.92. The biggest weakness was the Falkens too soft (sense of wallowing vs KO2's at 50 psi old truck) even at 41psi temps at 95 to 100 degrees the whole trip. Most important. Plenty of power.
First impressions. I was running at 72 mph and less on the passes regular traffic, on 10 mile 35/45 mph construction zone. I had 1300 miles on the odometer at start.
First impressions: Mileage 8 mpg calculated 8.6 by lyometer. Plenty of power exceeding expectations even up passes. Not as much as my old 3.92 2015 Outdoorsman and delivers it differently as you can tell the tranny is doing some of the work vs a 3.92. It spent a lot of time in 5th gear some in 6th and a little in 7th. Never saw 8th. Tow haul. Mileage about the same as the 3.92. The biggest weakness was the Falkens too soft (sense of wallowing vs KO2's at 50 psi old truck) even at 41psi temps at 95 to 100 degrees the whole trip. Most important. Plenty of power.