Most likely they were Group 31 top stud batteries, 1000 amp CCA. Check the battery cable ends before you purchase replacements. If the cables were held on with a nut and washer onto a threaded stud on the battery, they are "top stud" batteries. The other configuration is a top post. Take a picture of the cable end with you when you go shopping. That will insure the sales person sells you the correct battery.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
US Gear UBS