The group 31 batteries are usually stud type, but you can get them in post style. Most batteries have the posts which require the clamp connectors, which cause all kinds of problems. I got the battery at my local Navistar truck dealer. I remarked at the cost, and the guy said they sometimes even had them on sale. They buy them by the pallet. Most big trucks use three or four of them.
I had to change my cables over to a copper lug with 3/8" eyes to go over the studs. The studs are 3/8" coarse thread, and you can see the SS battery nuts I bought, also.
You can still get some corrosion issues, but if you maintain the batteries, they usually stay clean. The other advantages of this style is that you always know it's a 9/16" wrench to remove the nuts, the nuts aren't all buggered up and the head stripped out of the lead, you don't have to fight to get the clamp off the post, and everything can be cleaned quickly with a wire brush if they do get corroded. Also, if you are running multiple batteries in either series or parallel, you can easily attach multiple cables to the same stud.