Do they allow large vehicle parking....big trucks and trailers....to go shopping?

I dont see why not long as you dont park near the front

Yes I saw semi truck parked there.

Yeah

I have never seem one, but I don't see any restrictions.Jus park near the back mabye

I never saw any specific parking spots for oversized vehicles but I see no reason why you would be unable to park there.

Yes.. if you park neat the rear

Yes

I have never seen one in the parking lot

It's a very large parking lot campers and large trucks usually park near the rear