Can you use your TV satellite for satellite internet?

I was reading online about satellite internet for RV's. We have a 2010 Winnebago Via and we have an in motion trac vision satellite on the top for satellite tv (direct tv). I read online that you can use your tv satellite for satellite internet. Is this true? If we somehow got satellite internet (hughs net) in our RV would we have to get a new satellite on the top or can we use the same one? Also, to get the satellite internet, do we just talk to our RV dealer?