So, you have a couple of options. You can take your unit to an authorized dealer with a service department and have them weld on stabalizers. Or use jacks but I think that would become a hassle. The service department may not charge you for the welding if you buy the stabalizers from them.
We have some trailrunners at our lot that dont have stabalizers on them and are brand new. It is done that way to cut down on some of the cost for the customer on the front end, but later they run into the same problem and end up needing stabalizers. If you purchased new, speak to the dealer and see if they wont add them for you. If your unit is older, go with my initial suggestions.
Good Luck