This is why stabilizer jacks are important. Haul-Master 2.5-ton Trailer/RV Scissor Stabilizer is Harbor Freight's strongest stabilizer jack and can hold a weight capacity of up to 5,000 pounds ...

Harbor Freight also has an entire category on ... and you can drill through the bottom of the box to mount it to your trailer tongue or RV bumper. The box is 16 inches high, 33 1/2 inches wide ...