Since I don't want those high price, cold natured lithium batteries we had to bulk up the front compartment to handle the weight. After three years and close to 40000 miles and a trip to Alaska and back we noticed the front pan starting to sag some. No problem though. Found a good mobile welder and he came by and fixed our issue.
Kim we have the 4-6 volt T-105's and the four -6 volt T-105 RE's..I bought the T-105's in Oct. 2014 when Eddie installed the original Solar on our Cougar back in 2015 and we bought the other four last summer in Alaska.