Hi HarmsWay,
I use a Sola Basic which offers three levels of boost (at 110, 100, and 90 volts) and one level of buck (135 volts). I use an add on surge device which offers much more protection than the PD, SG, or Hughes.
I do manually check voltage under load, and polarity before I plug in the RV. If that shows lots of voltage drop I add the Sola to the power path. I do lock it down enough to prevent casual theft, but in these days of battery powered cut off wheels it would not stop a determined thief.
The Sola units are sold in Mexico, so to get one you need to have a friend who will purchase and transport it for you (or make a Mexico trip).
http://www.isbmex.com/productos/corrector-de-voltaje-8-y-4-kvaThe Hughes offers the same level of surge protect as the PD. I don't know if the SG unit is more capable, but I doubt it.
HarmsWay wrote:
Do you use one of those units? They seem quite large so I assume you keep it outside. Any issues wrt theft or weather?