In most states, I can understand driving slow (55-60) but here in Texas, if you try to take the surface roads, you will be driving for 10 days. Out across WTex. it is 80 and 85 mph. And there aint no alternate roads. Going south to Rockport, I drive 65-70 mph, but I also stated I have high speed G rated tires on my fiver and my truck.
Actually from I-8 west from Tucson, Ive hit 105mph and no problems. Try pulling your rig down I35 at 55, they will run you off the interstate.
Yes , in Tex they have a towing speed...........what ever you want until they stop you.