The only IHS site I am familiar with had trailers (not RVs, full-size three-bedroom mobile homes) available for visiting personnel, and you could get satellite internet/TV (the only option was satellite). Most people who were there long-term, though, preferred to live in the closest town, about an hour's drive away.
My friends were at a different IHS site, and there was a dorm, I think it was a two-story building with several rooms? But there was no cooking facility. The trailer I stayed at had a fully equipped kitchen (though I was fed two meals a day at the facility, and the food was legitimately excellent, so I only made breakfast).
I think it really varies from site to site what the options are and how easy or difficult it is to get there from off-campus housing, so I would recommend you contact someone who is working there and ask what they do and what they would suggest.