I was thinking about upgrading, but I am still working and not retired so I decided to keep the same setup and just replace the batteries. From reading from the threads I went with the T-105 Trojans.
ITOA has IQ4 Smart Charger that will plug into my DLS-75 and hopefully help keep the batteries in shape (with the belief that the problem were the old batteries). After I finished the house batteries I also changed the chassis batteries, as both sets were 5 years old.
Maybe by the time these need replaced I'll be ready to retired and give the upgrade another look. Thanks all for the input and the information this site provides.