IMO, there should be a 3 x Tier Surge Protection system in every RV/TT.
- Tier 1 - At the post. This helps stop (reduce the surge) coming from CG grid - down your RV's wire. A good product is: http://www.progressiveindustries.net/ssp_30.htm
Note: This product also has LEDs to perform instant checks - before plugging in your RV/TT's main power cord.
- Tier 2 - At the RV's electrical distribution panel. A great product (that also allows Low Voltage Manual by-pass) is EMS-HW30C Progressive Industries. re: http://www.progressiveindustries.net/ems_hw30c.htm
Note: Get the product with remote display.
Note: I original bought the Surge Guard (install it and leave it) product. Knowing what I know today about Low Voltage and sometimes needed to by-pass low voltage conditions, I'd get the EMS-HW30C with Remote Display next time.
- Tier 3 - At the sensitive electrical outlets that has > 1,000+ joules. re: http://www.monstercable.com/images_3...120241_001.jpg
Note: Unknown to some, spikes happen from internal appliances as well. These outlet level items on fridge, coffee pot, your TV/DVD/Media Players, etc. help reduce spikes from inside the RV/TT.
Note: If you plan to keep your RV/TT for 3+ years, I would highly recommend installing above items during 2 year time period. Start with Tier 2 (the heart) and next year, install outer perimeter surge protection layers next. And after 2+ years, your RV/TT has MAX Surge Protection coverage. For the Service post portable unit, simply use a small chain and paddle lock with large U shape lock. Put the thick power cable within the U shape. Easy and low cost - to keep the honest people honest.
For my RV/TTs and knowing what I know today, I'd installed all 3 Tiers. Best of all, Tier 1 (post), Tier 2 (heart) and Tier 3 (outlet) layer items can easily be removed and re-installed within your next RV/TT. Or, be easily removed and sold (if/when your sell your RV/TT). Thus, getting some cost recovery as well.
Hope this helps..