Zoo having 4 up has actually allowed us to increase our print speed dramatically. When we took on a massive order that required on pocket printing we decided to try to get the fastest possible set up going, initially we didn't know if loading and printing 4 on one palette would make a difference but it actually does. My loader can load 4 index then load 4 more much faster than load one index then load another. I think anything between 3' and 4' is best fine for just about anything out there, but in our case we needed smaller because these are custom made shirts with the smallest pocket I have ever seen.