Help.. I may buy a 1998 TM 3225..need advice!!!

I am looking at a 98 TM 3225. I am trading up from a Coleman Niagara.
1. Are there any reasons why I would not want a dual axle?
2. Any major problems with this model?
3. Any suggestions on what to look for?
4. Are winter rodents a problem? Can they get in easily?
5. I will miss my outside stove can I get one for a TM?
6. Can you buy a screen room for the awning?

Thanks for your advice.

DAN