Yes
Somewhat. It's not designated, however nine will say anything if you park on the day end of the lot from the building. They do it all the time.
There is room
Plenty of room for 18-wheelers both at supercenters on Loop 288 and on University Drive (HWY 380).
There's no designated spots, but in the sides our way out in the parking lot I've seen a few parked there overnight.
Might be more room at the Walmart off I35 at Hickory Creek
Not actual designated semi parking but probably ok on the end/far sides of their parking lots. I would just let the store know and they can direct you to an area
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