I may as well join in. I won't jump on the safety bandwagon, Jammer. I think you got enough of that.
How about we focus on a few other things.....
You said "... Thus allowing the use of all the 110/120 outlets and appliances in the camper...".
- A 2000W inverter won't cut it as far as powering ALL the outlets AND Appliances.
- My (properly wired) 2000W inverter complains when using an electric skillet; it work, but it complains (short beep to alert of an overload for a second when the heating elements cuts on).
- I finally rearranged things so the outlet the DW uses for the electric skillet isn't on the inverter. oh - and this is when I am on shore power (but things still go through the inverter).
So don't get delusional about what you can do with just 2000 watts. Maybe a single appliance, one at a time, but not much more since you'll have may only 600 watts left after a skillet, hair dryer, or coffee pot. Still it can be enough for what you want.
I'd suggest if you want some inverted power for when you are not on shore power you might consider putting your inverted as close as you can to you batteries (hopefully at least 200+ amp hours worth), use some 4-0 cable run an extension cord to what you want to use (as I don't think it will be many things for very long). I'd run it in some PVC conduit under the trailer and forget trying to run it all the way through the underbelly.
Other option is to put the inverter in a location as suggested above and run some properly sized AC wiring to and from your electric panel (which I assume is in the other end of the trailer) and the inverted and make a proper install.
Nothing is easy anymore - everything is a project..... We just don't know how big a project until we get into it.....