Other types of RV accessories are designed to protect mechanical aspects of your camper. For example, new trailer brakes and torsion axles are necessary if your vehicle breaks down. However, you may also need to get RV leveling blocks to keep your camper from moving under uneven ground. These items are useful for keeping your camper running properly.
It sounds like there may be a short in your Bulldog jack which could have been caused by excessive moisture from the rain. Also I recommend checking the wiring from the jack to the ground and power sources. The jack grounds through the mounting hardware so you may need to temporarily remove the jack (be sure to support the trailer another way) and sand away any corrosion. Also check for corrosion or damage to the power wire and where it connects to the battery. The light switch...
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Keep your trailer in line with this system that uses a telescoping bar with friction pads to correct trailer sway. Built-in grease zerks in the head provide simple maintenance. Includes an adjustable maintenance Powder coated steel resists corrosion Snap-up lever eases hookup by reducing lifting required by trailer jack System includes head assembly, adjustable shank, 2-5/16" hitch ball