Stabilizer bars

Hello Everyone!

Newbie here! Just picked up a C951 slide-in.. The gentleman didn't have much knowledge on getting it in to my truck for transporting it. Its still at his house and I have an F250 short bed ( 7' ) bed size.. What kind of stabilizer bar do I need and where can I purchase one? I just need to get it back to my place for some TLC. Anyone have some advice/tips?

Thanks in advance!