Roadmaster Front Anti-Sway Bar for Motorhomes - etrailer Roadmaster Anti-Sway Bars - RM-1139-140. Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the front axle and to the frame to balance weight transfer and reduce body roll.Price: $468Availability: In stock What’s the Deal with the Battery Disconnect Switch? Question. We recently had to replace both the engine and coach batteries on our RV. There is a button on the door for battery use or store. What is that button supposed to be on? RV Systems & Appliances - iRV2 Forums RV Systems & Appliances - Discussion of heating, cooling, electrical inc. batteries, plumbing, appliances, LP gas, audio-visual, and other internal RV systems. RV Battery Basics: A Beginner’s Guide | RV Repair Club Types of RV Batteries. Batteries used to power the coach in an RV must be a deep-cycle design to withstand the frequent and deep discharges and recharging they typically receive. RV Questions Are Answered Here You can ask an RV question here. Do you have questions about Recreation Vehicles, Camping or the RV Lifestyle. We will give you the answers to those questions.