Mr. Beef wrote:
to Texas to Kansas
By that - I'm assuming you don't plan to go west of I-45 - the freeway between Houston and Dallas, or certainly not past I-35 - the freeway from Laredo to San Antonio to Dallas to Oklahoma City to Wichita to Kansas City.
You can easily put two or three thousand miles on the road traveling in Texas from east to west to north to back east.
A few things about Texas.
The east Texas Gulf coast is okay, but nothing like the Florida panhandle coast. You probably don't want to go out of your way to visit Galveston or Corpus Christi for the beaches.
Texas has wonderful state parks, some with full-hookup sites. Many were initially built by the CCC. Some of my favorites in east Texas are Daingerfield, Caddo Lake, Tyler, Bonham. State parks are open year round.
Texas also has many wonderful US Corps of Engineers campgrounds on lakes across the state. Lake O' the Pines is very nice in east Texas. Most COE parks in Texas are open year round - one on every COE lake will be open all year. (A note - flooding in 2015 and 2016 damaged several campgrounds. The COE has not repaired all those, so some individual campgrounds might be closed until repairs are finished.)
Lake Texoma north of Dallas and COE parks in Oklahoma are closed from Oct 1 to either late March or late April.
The big cities - Houston, Dallas/Fort Worth, San Antonio/Austin - are worth a visit if you like big cities. There are few campgrounds in the city area - most are on the outskirts.
For Houston - we tend to stay on the north of town.
For Dallas - Cedar Hill State Park is centrally located to the south of the metroplex on Lake Joe Pool. Hickory Creek COE Park just of I-35E is north of the metroplex on Lake Lewisville. Holiday COE Park on Lake Benbrook southwest corner of the metroplex. In Grapevine near DFW airport is a good park run by the City of Grapevine - The Vineyards at Grapevine.
For San Antonio - there is on park in the central city that a lot of folks like. Name escapes me. We like the COE parks on Canyon Lake.
The Texas Hill Country is a stretch between 15 to 50 miles west of I-35 running from west of San Antonio up to near the Oklahoma border. The most popular areas are west of San Antonio and Austin. Many great state parks in the area and several very good commercial parks.
Trying to pick a best park or two in Texas is like trying to pick the best item on a Las Vegas casino buffet.