i am 6-4, 250 lbs and I can shower in the 2109s. Its tight, the shower curtain may get a little Grabby and as we all know, never drop the soap. With that said, adding splash guards, an actual shower liner and putting a small basket in the shower corner go a long way towards fixing this. Also, replace the shower head, you will be glad you did.
For storage... I don't have the murphy bed, nor do i want it. I have plenty of storage in the pass through. In reality, we have very little stored above the bed or above the sofa. Last year at a float trip a storm came up. we had 8 people and 2 dogs comfortably in the trailer hanging out. (3 on the sofa, 3 on the bed, 1 cooking and another in a camp chair by the door. Dogs on the floor)
our yellow sticker says 3820. I have the oven, the slide topper, the power jack. I don't the new package that comes in brown.. but i have everything else. Our 21fbrs is a 2015 in title only and is exactly the same as the 2109s.
if you want additional info, I will try my best to answer any specifics you have.
2015 Ram 2500 4x4 6.4l with 2015 Flagstaff 21FBRS
Wife, myself and 2 furry kids