New Batteries - any suggestions?

Just went from the original NAPA "deep cycle" 12 volts on our Winnebago to 2 Sams Club 6 volts. HUGE improvement. Be aware your battery hold downs will not work with the 6 volts. Took me a while to find something that worked. I remember the old hold downs that encircled the top of batteries and had two bolts to secure them.They apparently do not exist anymore. What I finally found was from a Yamaha golf cart dealer, BAT-2005. This is a plastic bar that goes along the long side top edge of the battery and has a hold down bolt on each end that runs at a 45 degree angle to the battery tray. You need to add pieces of angle at the rear and sides of the battery on the tray to prevent sideways or rearward movement of the batteries once you install the bar. Makes for a very secure battery mount. Much better than the flat bar that came with the original 12 volts. The problem with 6 volt batteries is they don't have much of a clear shot across the top for a hold down bracket because of the filler caps and the raised terminal area. If you go the 6 volt route, you should get the water filler devices that replace the caps and let you use a squeeze bulb pump to keep the cells full.
https://www.amazon.com/Flow-Rite-RV2000-Pro-Fill-Battery-Kit/dp/B001FCAXT0/ref=pd_bxgy_263_img_2?_encoding=UTF8&pd_rd_i=B001FCAXT0&pd_rd_r=9PVMEEQ5Q1Q06FKKD3F4&pd_rd_w=pw86g&pd_rd_wg=PBTcH&psc=1&refRID=9PVMEEQ5Q1Q06FKKD3F4