Is there space to park a semi while shopping?

There is! It is very big

Yep. Several. BEHIND the store

In the rear of the parking lot of Walmart I had noticed big rigs parking there.

Oh yeah, I've not seen semi's but I've seen big motor homes so I'm sure the Semi will fit, tons of room!

Yes, they have a huge parking lot.

I don't think there are specific spots for a semi but the parking lot is pretty big