The CURT RV Towing Starter Kit comes with everything you need to maximize comfort and control when towing a small travel trailer. Ideal for vehicles with less than 5, 000 lbs. GVW and trailers with 3, 500 to 5, 000 lbs. GTW. The loaded ball mount features the RockerBall cushion hitch ball that helps dampen jerking and jarring for smoother towing. The Echo Brake Controller features Bluetooth so you can control the trailer brakes from your smartphone. The RV Towing Starter Kit #45190 includes a 2-5/16" RockerBall, sway tab ball mount, Echo Brake Controller, sway control kit, and anti-rattle.• Ideal for vehicles with less than 5, 000 lbs. GVW and trailers with 3, 500 to 5, 000 lbs. GTW• Rated for a maximum of 7, 500 lbs. GTW and 750 lbs. TW• Loaded ball mount with RockerBall cushion hitch ball and welded sway tab• RockerBall dampens jerking and jarring for smoother towing• Echo Brake Controller uses Bluetooth and your smartphone to control trailer brakes• Echo easily plugs into a 7-way RV blade connection for zero-tool setup• Sway control unit helps limit lateral trailer movement to reduce sway• Anti-rattle helps stop vibration and shank movement• Ball mount fits 2" x 2" receiver tube openings and 2-5/16" trailer couplers• Tested for safety to meet SAE J684 specifications Sway control unit helps limit lateral trailer movement Echo Brake Controller with Bluetooth lets you control trailer brakes from your smartphone Fits 2"" x 2"" receivers & 2-5/16"" trailer couplers | Curt RV Towing Starter Kit in Blue