Concur with Camping World for the wipers.
Vi reported that the washer fluid hose was a match for garden irrigation sprinkler tube - pretty cheap at the hardware store. I would take a piece to the store to match it.
Bra's are a contentious issue. Any road grit under a bra will damage the paint...but the protection is obvious. I guess if you keep it clean underneath it would be a good upgrade. These are not like bra's for cars due to the low demand and most all RV models have individual styling. But would just be a big rectangle with straps, so maybe an automotive upholstery shop could offer a custom.