I wouldn't get it.
Don't get me wrong. Progressive makes excellent stuff but I just wouldn't get that particular model. The SSP-50 is strictly a surge protector. Many of the problems in RV electrical systems are caused by low voltage rather than a surge or spike. To adequately protect your system against them you need a surge protector that also includes voltage detection.
Check out Surge and Spike - Protecting Your RV's Electrical System - RV Magazine
for an article I wrote regarding that.
In this case I would recommend the Progressive Industries EMS-PT50C - which has that capability. I use the EMS-HW50C myself, which is hard wired into the coach. That way it's theft proof, out of the weather, plus the remote display can easily be read ftrom within the living area of the coach. But, if you prefer a portable unit, the EMS-PT50C is the best choice.