If you're 2 years out, that probably equates to about a year and a half where you really don't need a Class I. However that said, why let it lapse, because it's always easier to keep a Class I than it is to get a new one, and in the overall scheme of things, it's cheap.

Many of the respondents have mentioned that you would do well by doing a ton of research here. Your comment was (basically) "why bother to reinvent a wheel." In my mind, the reason to do the research is at least two fold: the first reason is that you will almost undoubtedly have all your questions answered; while the second is that by doing your research, you will come across many more questions and answers that you would never have thought about in the first place, thus making the whole learning experience more valuable. Just my take, as one old time hog driver to another.