Nearly right!!
You can use a CALCIUM battery on your cossie but it will not last long as charge rate will be way too high.
These batteries cannot take high current charge rates as found on older cars, that's why most new cars charge is ecu controlled, they charge VERY slowly.
You can get a heavy duty with more plates for more amps cranking, or for morer AH capacity install a larger one in the same tray, will be a bit longer.
FORD terminals are on the way out, as most are now round, my local battery specialist does not even stock a ford type one!!
You can get a 70 ah one in there no problem, or gel mat etc battery but not needed as deep cycle battery.
tabetha