There are lots of posts on this, so it maybe worth doing some reading. Vic Harder has an excellent write up of his power system and decision process, which would be a good place to start.
If you plan on adding solar than a DC-DC charger is probably unnecessary.
To answer your specific questions:
Are people generally mounting the breaker and DC to DC charger in the camper and not in the engine compartment?
If you are going to use a DC-DC charger, then you want to mount it as close to the battery as possible to minimize voltage drop between the charger and battery. This poses an issue with the Renogy, as it needs a 'trigger wire' to know the engine is running and that it should be charging. This means you need to run 3 wires back to the camper. There are other choices of DC-DC converter that activate by sensing the voltage on the input, such as the Victron Orion-TR.
-If so, is there some sort of quick connection that can be used to make hooking up easier when putting the camper on and off?
Any connector capable of handling the current will work. Another thing to note - if you are using a DC-DC charger, then voltage drop between the truck and the charger is not so important. The wire just needs to be able to handle the current. For a maximum of 30A, 10AWG wire is fine.
I know that there are wiring threads all throughout the WTW forum (and others), which I have been taking advantage of. But I found this hand drawn diagram in our camper so I wanted to post it here to see what people thought. I'm guessing it was drawn by a former owner who did a bit of re-wiring of their own.
We have a diesel truck so the setup will be on the left side of the vehicle (as opposed to what is drawn on the diagram). I've already ordered a deep cycle battery which should be here tomorrow. Was thinking of using Renology DC to DC charger between the truck battery and the house battery, with 4 gauge heavy wire as recommended on many posts. This is different than what is drawn on this diagram, so if there is any reason I should not change the set up let me know!
My questions are:
-Are people generally mounting the breaker and DC to DC charger in the camper and not in the engine compartment?
-If so, is there some sort of quick connection that can be used to make hooking up easier when putting the camper on and off?
I can't quite read the writing on the left hand side of the diagram, but a previous owner has already installed a powermax 120 to DC converter which works great. I am also curious how this all will be tied into the battery - seems like just running wires with appropriate fuses. I'm going to try to take the front counter off today to get a look at how things are currently wired up and can post a picture later. In the older models the fuse box isn't super easy to access without taking things apart.
Thanks all!