RV Slide Out Support Jacks Set of 2, 6000lbs Heavy Duty Supports, Adjustable 20"-49" Height by Power Drill or Handle, Slideout Stabilizer Jacks RV Camper Accessories for Travel Trailer-Black. UPGRADED 6000 LBS LOAD CAPACITY Outperforming the standard 5000 lbs market limit, our heavy duty support jacks are engineered from high-strength alloy steel and reinforced galvanized tubes.