I have had both kinds in my RV's. There are tradeoffs to both. I don't know if trade-in value is a concern for you or not, it doesn't really affect my choice. As to your questions:
1) No-one on a forum can give you a good answer. You need to do your own research and test the refrigerator model you intend to buy. Take a clamp-on ammeter and measure start-up and running draw. Figure out an average duty-cycle figure for your operating environment. Look-up the efficiency of your inverter. Calculate a daily amp-hour figure and match that against your available capacity and recharge capability. The start-up draw frequently causes problems with this set-up.
2) I don't use one.
3) I would use a pure-sine wave inverter for the reefer and electronics.
4) I've never had any problems.
Miles
