A friend and I are going to be doing a road/mtb trip from Denver to San
Francisco late April-early May and we were looking at rental cars -
ending up with more questions than answers.

Anyone have any advice or things to look out for when renting a car?
Especially if you're a crazy foreigner who drives on the other [correct
;-)] side of the road.

One of the other questions is around insurance - insurance is
complusory I presume but there appeared to be several different levels
of insurance, any recommendations or things to look at?