Great link, Bob. I'll offer one other piece of advice, as we deal with these battery issues on a daily basis. If you're going to switch to a true deep cycle use battery, like the Trojan T-105's or equivalent, be prepared to actively take care of them if you want to get the best use and longest life out of them. That means not drawing them all the way down to dead, monitor the electrolyte in them frequently and make sure you have an appropriate charging system that won't boil them dry. (not everyone has a converter with a charge-wizard built in) They will do best by being used, as they are made for charge/discharge cycling. If you have a charging system that offers an equalization mode, so much the better and it's good to do this on avg. once a month. (Many solar controllers offer this feature) Obviously, if you use a Gel or AGM, you don't have to monitor the electrolyte, but the other stuff applies.
I've had to retrain myself to not automatically plug in when we get home, but use the battery capacity until it draws down, then plug in. We haven't been dry camping since we installed the batteries, so have to give them a workout when we can.
Hopefully with the addition of solar this summer, I can just forget about that as it will be automatically done for me.