Been there a couple of years. It's a huge show, probably lots of deals. If you haven't booked a spot, it's likely too late. You can dry camp, but they'll still charge a premium for it (like $50 a night or something).
I've been to that and the Tampa RV show. I tend to think the Tampa one is bigger but I don't count everything and the Hershey folks say theirs is bigger. I guess the weather is just nicer in January down in FL
If you've never been to it, totally go, well worth it. But as noted, wear very comfortable shoes, expect to walk a lot, big area to cover. Spending more than one day might be a good plan, depending on how much you want to see, work a deal, etc.