Depending on traffic, I-95 (FL) <65 sometimes in 5th gear, I-10 70mph @ 2000. Any slower than that, it loads up to fast on hills.
Really need an EZ or a 4:10. Gonna try the EZ first. If your towing all the time you should have the 4:10. 65mph with a 4:10 is perfect. Had a 4:10 in one of my other trucks.
Dave