We have the TRC (Surge Guard brand) system, which is integrated with our auto transfer switch. Progressive is a fine unit also. I've seen lengthy debates or which is better, but am not impressed with the arguments either way. Mostly splitting hairs, IMO. If you see pluses for the Progressive unit, go for it!
The question of whether you need it or not is more difficult. Depends on where you camp and what is going on when you are there. "Surges" aren't really the issue in most places, but you may encounter miswired outlets, low voltage and other power problems. A combined surge protector and power monitor is insurance against that (relatively rare) situation where a power problem could damage one of your appliances, most likely an a/c. Older - or smaller - RV parks tend to have shaky electrical systems and oddball things can happen. That's when having a power monitor device can avoid problems.
