I have done almost the exact thing that Greg did (GMTA!). In fact it was the first mod I did.
The Progressive Industries EMSHW30C Surge Protector is more than just a surge protector. One feature I found handy was a cut off when the voltage gets too low (primarily to protect A/C units). When I was at a site with bad power regulation last summer, and using my air conditioner, the PD unit shut the power off not once, but twice, when the voltage dropped too low to safely run the A/C.
However the shore power connector I bought is plastic and it would be easy to cross-thread it. I have to be careful when putting the plug on the camper. Other than that I love it... it even has the LED that
lights up to let you know you have a connection to shore power. Then you go inside and look at the PD's display to make sure there is no problem with the electric supply.