We always stay at the nicest campground in Quartzsite, but will keep that a secret. There are MANY campgrounds near the big tent, but would probably have a rating of about 2-3 on a 10 scale. I mention this in case you decide you don't want to boondock. There was a mix up regarding our site last year and we had to find a site during the week the RV show was going. They're available if you need one.
A handy product would be a small folding dolly, either the basket type or the folding business dolly that Costco sells. It works great for hauling whatever you need to haul and especially if you need to haul things you buy at the show. The show has very little parking nearby and you often have to hoof it awhile to get through the maze of RV's and flea market vendors.
Lastly, there is a Spartan chassis truck there every year. I bring a list of my filters, leave it with them and pick my filters up later. It works well.