In Houston there are a couple of places to consider. Probably the best for a rig that long would be Lakeview RV Resort which is on the south side of Houston by the Astrodome / Medical Center (
www.lakeviewrvresort.com). They have several sites near the front entrance that are not limited in length and would work, but their regular sites would be too short. The other choice would be Rayford Crossing which is located north of Houston in the burbs (
www.rayfordcrossing.com). They have concrete roads and sites, but you will want to call in advance to make sure they can accomodate 75 feet plus setup.