Lane numbering is as follows...
1- nearest center divider....
2-5. From left to right....
Towing is 55mph.... Period. No variance. But... Seeing that your trailer tires are rated at 65... I'd rather not have a blowout and save the fuel...
Motor homes and toads... Are limited to 55mph. Yes everyone can push 60mph with no trouble but mind you... Any vehicle at anytime can be ordered to the scales for weighing... Just be under your weight class for your DL.
Stay in the two most right lanes... I stay out of the far right 90% of time.... Due to vehicle merging and such.
Common sense people. Common sense.
