IH-35 has been lousy for forty years. And only gets worse with each passing year. I drive 10-12k miles/month through Texas and surrounding states and wouldn't recommend this one. Ever.
If US-281 can work then it is far more scenic from the OK border to Mexico than 35/77 to the RGV. US-281 runs from Canada to Mexico across the US from North Dakota thru Texas. Always a good choice.
Koffee Kup in HIco and Bluebonnet Cafe in Marble Falls.
1990 35' SILVER STREAK Sterling, 9k GVWR
2004 DODGE RAM 2WD 305/555 ISB, QC SRW LB NV-5600, 9k GVWR
Hensley Arrow; 11-cpm solo, 17-cpm towing fuel cost