Congrats on the new trailer! We just bought the same one a few months ago! We purchased about 95% of everything so far on Amazon. I would recommend getting the propane cover to accommodate larger tanks in case you ever decide to upgrade the tanks. Plus I think it looks better in proportion to the size of the trailer. We got this one.
https://www.amazon.com/Camco-40539-H...+propane+cover
I also did a mod under the bed to add support since there was NONE to begin with. Added two "walls" as well as a support to stiffen the piece on the wall. It was only held in by 4 screws to begin with. Pictures attached.
More mods are coming soon enough. Opening up the space above the microwave is next!