Batteries good?

[navybanker]

Camper back from repairs from dealer and two batteries hooked up parallel. Group 27 deep cycle and three year old Interstates. Level up shows 11.9 volts so use my multimeter and it shows 12.0 on batteries. Call dealer and they check it in storage next to dealership and says the batteries are fine. I checked voltage on wires on top of battery box with power from both batteries. They say different from automobile batteries?? I hear something new everyday but this has me puzzled. No power supply in storage. I haven't tried anything to see if things work. Want to make sure camper is ready to go when go on next trip. Storage lot is one hour away. Educate me!!