A year ago when I was researching what surge protection I wanted to use I remember some folks having issues with the fault circuits failing on some of these units at the most inopportune times. A solution one person had was to wire it in using a plug into a socket in a manner that it was simple to bypass if it failed. The downside is it took up more room. Take some time to figure out how you would debug, bypass and replace the unit while out on the road.
I choose to solve two issues with one item by going with the Hughes Autotransformer to assist with under voltage situations as well as surge protection all in one easily bypassed unit. Down side is it takes up a bigger part of my cargo area in my tow vehicle than I would like and is a bit expensive. But it has a very low failure rate.
http://hughesautoformers.com/autofor...an-autoformer/