Outlets

Some folks have installed an extra outlet in the camper and wired it to a waterproof plug on the outside. They then connect the camper to the 20A outlet on the pole with a short 12 gauge extension cord. The added outlet is most often used to run an additional 1500 watt heater. The existing 30A circuit will only support two 1500 watt devices so the microwave plus WH plus electric space heater cannot all be running at the same time. The added outlet allows the electric water heater and the microwave to use the original 30A system at the same time. Sort of a poor man's 50A hookup. 

If you just need two more outlets inside, it should be easy to add them if they are close to the elec panel and just replace one of the single breakers with a dual, as for the cord, you just need the adapter to 110 20 amp on your 30 amp cord and be plugged into a good 20 amp circuit.should power everything fine except the A/C

I am not sure if you want to add outlets to the existing circuits, or add a new circuit taking advantage of the extra outlet in the pedestal. If the idea is to use the extra outlet in the pedestal, I used one of these...

Inlet.

As Charlie noted above, we use it run a ceramic heater when needed.

If just adding another circuit to the existing distribution center, if you have an open space, no issue, other then the fact that you still only have 30A to use.

The 171 (and others?) doesn't have any convenient outlets in the dinette area..... which is where we need them for things like a table lamp, PC power supplies, USB chargers, etc.  In addition to adding a duplex outlet under the left seat, I also added a 12V outlet since the 171 has none.  We bought a 12V three way splitter that also includes four USB outlets that we stuck to the front wall under the table with Velcro.  It even has a voltmeter in the plug.  That gives us two 120VAC outlets, three 12V outlets (useful when camping off grid) and four USB charging ports in the dinette area.