I don't know about transfer switches or Perkos. I find with a receptacle type inverter and Honda gen, it is no trouble at all to plug the shore power cord into whatever you are using at the time: pedestal, gen, inverter.
It is not like you are swapping these around frequently. You arrive somewhere and it is either inverter or pedestal. If it is inverter, then every so often you might also need the gen. Less often if you have solar.
Anyway another excuse to show my picture from last year--just make yours a PSW 2000 instead of my MSW 2000. Use your 175w instead of the 1000w shown here as your second inverter (or just use the 2000 for everything if solar is keeping the batts up easily)
A. Shore cord and extension cord from special kitchen receptacle going from back of trailer into cargo bay through added cable hatch
Previously we used the 2000w for everything so it got the shore cord.
don't really need the smaller inverter, but have it, so using it.
B. This shows the front of the bay with the door up. Got the two inverters, each with a remote phone type line going back to inside the trailer. The 1000w does the receptacles for TV etc, using the shore power cord as 'whole house' and the 2000w does the kitchen loads -MW, kettle, toaster just using the extension cord itself (via an extra receptacle I put in the kitchen just for that.)
Also shown is the 100amp PowerMax converter, jammed in place with some wood, the solar controller (upper right with a red tab on/off switch on the panel pos input wire and its temp comp wire going into the battery compartment next door)
There is a pair of 6s on each side of what you can see here so it all runs on a bank of four 6s in series/parallel