TX 21 is a good road and will accommodate your rig - but parts of it are two-lane. We usually jog up to US 79 to travel between those locations.
Rob
U.S. Army retired
2020 Solitude 310GK-R
MORryde IS, disc brakes, solar, DP windows
(Previously in a Reflection 337RLS)
2012 F350 CC DRW Lariat 6.7
Full-time since 8/2015