It is not the ACE air ride, or the Road King shocks. It is neither the TS Performance module or the 6-6v Interstate Battery bank. It is not the Xantrex whole house inverter or my Fantastic Fans. This mod below takes the cake:
Yes, the Pro-Fill RV on board battery watering system. Drop one end in a gallon of distilled water, prime the line, attach it to the fill system and within a few seconds all 6 batteries are filled to the correct levels. No more sore backs, dirty shirts and shorts, flashlights, weary arms, bloody knuckles, turkey basters, wasted water and a whole mess of cuss words. I, literally, have all 6 batteries watered full in @ 45 seconds. Most of that time is taking the fill bulb out of the box. This mod is "hands down" the best dollar for dollar than anything I have done to the rig.
Damn I am getting lazy!