Thanks MUDHWY, but I've got two CPAP's to worry about now and need a solution for two units. I'd like to figure out a safe plug and play way to use the trailer batteries while camping. I already have two of the ResMed converter cords, so I'd like to go that way. The Anti-Gravity PS-45 battery looks like a viable option for running off the bikes on camping trips and the power for two units with 45 AMP HRS - if a bike's alternator/stator will recharge it over a day's ride. I'd really like to be able to try one of these out to see if it works for my wife and I.