Isuzu

Guys, I have two Isuzu trucks and I want to buy three more, meaning five Isuzu trucks total. I thought I'd save my money in them, but I don't know what to use them for—should I convert them into refrigerated trucks or flatbeds? Or should I keep them as mesh box trucks? I'd appreciate it if anyone with experience or ideas could help us out. May God reward you with goodness.