Is it possible, it there a space to park 18 wheeler semi truck?

I believe there is plenty of room in the back parking lot.

I believe you could park in their back lot. It is labelled for campers and fifth wheel parking. I believe you could also park along the street to their west. Take a left at the first light you come to exiting I-5 NB.

Yes but enter from the rear. Not a great intersection for a big rig

Even if you can't park in the parking lot behind the Olive Pit, there's a Petro truck stop right across the street

We parked our 31 foot motorhome and our toad.

In a word yes. There is a very large parking lot out back.

Yes. The whole area there is truck stop.

Yes