Re: packing, you don't have a lot of options ESP being hire. If you can buy yourself or two of you can pick the front of the draw bar up than that's about right, if you cannot than move heavier item toward the back. If the kitchen is a swing out type off the tail gate than put your heaviest item above the axle and all should be good.
I run 40psi all round on the defer and 20psi on the trailer.....1200kg trailer un-braked shhhhh

