wrichards,
I have the blue-tops (deep-cycle RV) in my truck. My first Optimas were the yellow-tops (deep-cycle). Those yellow-tops are several years old now and still going strong in my 1995 truck. One of the factory batteries went bad after about two or three years. (The other factory battery is still working in my diesel tractor. )
The blue-tops have the regular posts for our trucks, plus a 1/4" post with a wingnut for RV connections. I use the 1/4" post for accessories. Also, I intend to use these batteries in our RV when the oldest ones go bad. I'll buy another pair for the pickup. The only difference between their deep-cycle batteries of the same size is the type of connectors that are provided.
Optima recommends the deep-cycle batteries in our trucks, but many drivers have had good luck with the red-tops.
I cycle batteries down the "chain" so that the least critical application has the oldest battery. That usually works out to be the tractor, since I can always replace that one, or charge it, without too much inconvenience.
IMPORTANT:
If you go with Optimas you will need to pay attention to what QRTRHRS posted about the hold-down screws. There have been posts reporting that the screws will rub against wiring beneath the battery tray and cause all kinds of trouble. When I read about it, I cut an inch off each screw the next day. You should do the same if you install any battery that isn't as tall as the originals.
Loren