You say KC east side or west? You did not say if you mind toll roads? Also not sure where Wichita falls came from you don't go there it is Wichita, Ks you go if west side.
If west side take I 35 to Emporia then toll road to Wichita, or take US 50 "2 lane road" to Newton keep south on I 135 to Wichita. Wichita south on I 35 toll road app 40 miles when you get to US 166 get off half mile west is very small camp ground. In OKC keep an eye on road, once you turn west get in south lane as you will soon turn south to stay on I 35 south. Before Dallas take I 35W then back to I 35. At San Antonio I 37 SE & just before you get to Corpus Christi take US 77 & you will get to go by the famous King ranch and a few hr. you will be at your winter home.
East side I would take US 71 now I 49 to I 44 "toll road in OK" to OKC & I 35 remember south lane. Now Google will tell you to I 49 to I 44 then US 69 to US 75 then in Dallas I 35e to I 35 never been that way. I know some truckers who run KC to Dallas take US 69 to US 75 into Dallas "2 lane"
Mom & Dad were down in Weslaco for 18 years so made a few trips down most of time would go south at Three Rives on 281 but also would take US 77 some times as it is a better road.
