Jersey Shore to San Antonio to Tucson via Rt10.

You better check on Sea World San Antonio's schedule. It isn't open now but reopens on a very limited schedule February 24th.
There are two nice RV parks, Admiralty and Blazing Star, very close to Sea World. Admiralty is the closest by a few blocks. There are numerous Walmarts in the vicinity of Sea World. The one on Potranco (FM 1957) just west of Loop 1604 is where we shop. Occasionally we see an RV overnighting there. That Walmart is about a mile from Sea World.