I purchased a 10 ft hose to supplement my 25 footer. It allows us to balance the water filter on the bumper up off the ground and not have the weight of the filter hanging off the camper fitting, I usually hang the filter off of the pressure regulator but once in a while the standpipe for the campground hose bib is low to the ground.
I also have a 12 ga wire drop cord, which, with the adapter, allows enough power for most situations so far. We also carry the 50 amp to 30 amp adapter as well as the 20 amp to 30 Amp unit. If there's power, I'm able to get some if I need it. As Jon V remarked once, sometimes the 30 amp outlet is a little worn out from use but the 50 is in nice shape, that's when it's nice to have an adapter too. We are continually trading out heavier stuff for lighter items that will do the job.