The PT30C isn't a surge protector. It is what Progressive dynamics calls an Electrical Management System. The SSP30 is just a surge protector and under $100.00 Just clarifying what we are describing here.
The 30/50 amp adapter is a different issue. The 50 amp adapter just lets a 30 amp cord go into the 50 amp receptacle. Whether it's your existing cord end or the pd30c, either would plug into the 30/50 adapter.
The pd30c will plug into the power pole 30 amp receptacle or it will plug into a 50 amp receptacle when using the 30/50 adapter.
Some people want to carry this adapter just in case the 30 amp receptacle on the pole doesn't work and it's often recommended to use a 50 amp receptacle for a better power supply.
30/50 adapter
It's appears a little cheaper to go with the hard mounted unit and it's nice to know that it's in a dry area and not going to be stolen or forgotten. You can see the amp draw, voltage and codes right on the wall pendant.
The hard wired unit can be removed if you choose to change rigs. It's not hard to wire in. The remote pendant is a nice feature and plugs in easily with a phone wire type connector.
I think another advantage of the hardwired over the plug in is that you dont risk heat build up at the terminals of the pd30c when the campground power pole has weak/relaxed receptacle pins. In theory this shouldn't happen as a low voltage should occur and shut the pd30c off but if it did happen it may not be under warr. You could ask PD about that. So again, with a hard wired and a lifetime warr you are just about 100% covered.
Mounted with pendantIf you plug into a generator you will have to use the system bypass switch on the pendant. When the bypass is activated there will be no pendant display. This is because the generators have a floating ground and are NOT bonded. You are not worried about the generator supply, you are worried about the pole supply.