hone eagle wrote:
My trailer is close at 16500# . but you are incorrect , it goes up any 7-8% grade like it isn't there. and at the speed limit.
Ok, I'll take your word for it. My statement was based on experience of driving big trucks. Most I've driven required almost full throttle to maintain 60 empty (30K combined) up a 6% grade. Most freeway grades are not anywhere close to 8%. Running the numbers through a grade calculator moving 30K combined at 45 mph up 8% takes about 400 rwhp. Doing 60 takes close to 600. Here's a
link to a page with an Excel spreadsheet to calculate road speed for a given grade and horsepower.