I’m looking at a KW T800 06 model. It has an M11 in it. I run tri axles & gross around 62-63k. It’s got a 8LL & 4.33 gears. How will this handle a load? My other truck has a 12.7 with 4.11’s behind 9 speed. It pulls very strong. I’m not interested in running fast at all just don’t want to be lacking in HP to get job done.