I would try calling and ask. It is a shopping center parking lot...so it's not as big as a regular Wal-Mart parking lot, since it's a shared space! Good luck.
It would be best to park at the Wal-Mart on the East Loop 323 or at the Wal-Mart on South Broadway.I see Semi and large motor home park in the South Broadway Wal-Mart all the time.The Market is only open till 10pm weekdays the 2 I mentioned are 24 hrs.
You should try calling them. I think it's a shopping center parking lot.
Thanks! Your answer is awaiting moderation.