Higher-end models often have internal drain lines, but most coaches just let the condensate run wherever. You can direct it a bit by making the coach slightly off-level - it doesn't take much and you won't ever notice it inside.
My American Tradition has a pan under the a/c to catch the water plus a pump that delivers it to a drain line that comes down through the sidewall and empties onto the ground.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL