Do they have 18 wheeler parking???

No

Maybe on the street.

Yes, call ahead

I am not sure their parking lot for general parking would not accommodate an 18-wheeler but it is on an Indian reservation so they may have other options available for you I would suggest calling them ahead of time and I'm sure they would be able to accommodate you

Yes this place has you covered in the big parking lot in the back

I'm not sure if they do.

Yes, it's a bit of a walk but in the far side there is a parking lot for RV's and 18 wheelers