Barbara,
Because hubby wants to use it for business, you should know that campground wifis are still in what I will call the development stage. If you read some of the other threads on this forum you'll find that some campground wifis work great and others simply don't work as advertised. We've come to the conclusion that the campground operators hire someone to set one up and then don't know enough about it to make corrections themselves when something goes bad. Sometimes they aren't set up properly from the get-go and you have to be in a site that is almost on top of the antenna to get it to work. Many have antennas that just don't reach out to the far sites. Be sure to ask about their wifi before making a reservation if it's really important to you. We can live with it when we can't use it for email, but business is a whole different ballgame. We've seen people sitting outside trying to get wifi and it's not very satisfactory because of screen glare. Also, if you try to use the laptop's built-in wifi you're less likely to have an adequate connection.
Most of the people on this forum who use the internet for business have their own internet dishes for two-way communications. If you talk a little more about what his needs are, perhaps they'll be able to help you more. Personally, I don't think I would want to depend on campground wifi for buisness, especially if it requires large downloads and uploads. When you really need it, it may not be there.
Another idea is to get yourself an EDVO aircard. If you didn't see the discussion, go to the RVing message board called "PCs, Communications, Electronics" and look for the post "New Small Mobile Router for EDVO aircards and EDVO USB aircards."
ArdraF