7k should be manageable without sway or air bags but I would still add at least one of the two for such a long haul. The hitch is the easiest to add. Equal-i-zer is a popular brand. Get a brake controller installed.
Just remember don't overload your trailer. If its a 7k enclosed then it probably weighs ~3k so you can haul 4k worth of stuff inside, secure the load so it doesn't shift. Keep the tires in the trailer aired up to the correct PSI.
have fun and hammer down
Where ya moving from/too?