I have a 2016, 24ft Open Range Lite. The water pressure is the barely a steady stream. At home I hooked up without regulator and made no difference from using a 45psi. I traced all the lines, all hand...
I had a similar problem. The trailer water went from fine one trip to a slow trickle the next. The brass fitting on the trailer that your water hose hooks to has a check valve inside of it that is of poor quality. Mine decided to not let water pass. I took the guts out of it and we were fine for the trip. I bought the exact replacement from Amazon and installation was easy. However, I expect I will be doing it again someday.