Re: OH MY so much we dont know!
The 'tow package' really can't be added to a vehicle. What you can do is add a hitch and trailer wiring so it is physically possible to tow something, and the biggest, best transmission cooler you can get to reduce the chances of your transmission dying. A transmission temperature guage is very good too, as most transmission failures are preceeded by high transmission temperatures.
I think you will find that your 'towing capacity' with that vehicle is not much. They may claim 7000 pounds, but that is with no accessories, cargo or passangers in or on the vehicle, only a 150 pound driver and a bit of gas. Anything else in the vehicle comes right off the towing capacity. If it is equavalent to a 1/2 ton pickup, you probably will want to shoot for 5000 pounds or less. Also make sure the tounge weight of the trailer does not cause you to exceed the GVWR of the truck or the rear axel, although this is more common with fifth wheels than with travel trailers.
You are looking at sleeping 5 to 8 people at once, yet light weight trailers are 'short'. Probably your best bet is something which 'expands' when you set it up. It is remotely possible you can find something which will sleep 5, possibly with an air bed on the floor, but I seriously doubt you will manage 8. Consider an 'add on' room or separate tent in addition to the trailer.