irv2.com sponsor RVUpgrades also sells several models of
surge protectors that offer considerably more protection. Of course, they also cost more; but with all the expensive electronics in coaches today, it pays to have better protection.
RVUpgrages has excellent service, fast delivery, and good prices. If you have any questions, you can call or email them and get accurate answers.
Joe is correct that the 50 amp protectors can be used with 30 amp adapters.