I had Trojan 125s which are just a taller version of the 100s. They were good batteries, not worth the price. By that, I mean you pay double the price for them, but you don't get double the life out of them..........
In my DP I have four Costco 6V batteries at a lot cheaper price and in my TT I have four Interstate 6V batteries. If you can find the main Intersated area distributor in your area, go to them and see if they have any "blems". These are blemished batteries that may have a scratch on them, the labels got mounted crooked, or something. The batteries were only 2 months old and I got them at half price - that makes them about a quarter of the price for Trojans.
If you go to Costco for the batteries, they should have two different capacities. Get the taller battery.
Bill