The Surge Guard 41260 (about $215) has very limited surge & fault protection. So, yes, you should use a surge/fault protector.
The Surge Guard 40250-RVC (about $600) has full surge & fault protection.
2004 - 2010 Part Timer (35’ 2004 National RV Sea Breeze 8341 - Workhorse)
2010 - 2021 Full Timer (41’ 2001 Newmar Mountain Aire 4095 DP - Cummins)
2021 - ??? Part Timer (31’ 2001 National RV Sea View 8311 - Ford)
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