Congratulations on your new Road Warrior and welcome to the Heartland family. What to buy is a really tough question to answer, some items will depend on what items you already have and how you plan on using your new condo on wheels. The following items are ones we take with us, I'm sure others will chime in and offer their suggestions also. Here goes: air compressor, basic tools, volt meter, lawn chairs, folding table, grill, electrical cords (110 volt), 30 foot 50 amp extension cord, 100 feet of drinking water hose, 25-50 foot hose for black tank flush (different color than drinking water hoses), waste tank (grey & black) water drain hoses with clear elbow, tie down ratchet straps for what ever your got in your garage, blocks to place under your level-up feet, good bottle jack (5 ton), some type of chocks for your trailer tires, good tire gauge (150 psi), 5th wheel pin lock. That's all I can think of right now. Enjoy your new rig and safe travels.