Yes the RV is very light compared to the old / new 175's, but the OP of this thread has a very bad back, so his situation is much different than ours.
I grew up with a DAD that had just a terrible time with life due to his back, still to this day it bothers him even after surgery, Doc is trying to talk him in for one more. The pain my dad lives in I can not imagine, and even with all that pain he continued to go out and make a living for us.
The OP is probably just like my Dad living and dealing with a terrible pain everyday, but has no choice but to go out and clean.
The almighty dollar really sucks sometimes it rests for no one and has no sympathy for those that are suffering.
I would think the Mytee carbon fiber wand with updated spray manifold would be a good choice, the non swivel is pretty light, if you can find one now.