I moved from a TT to a Class A (no slide) then another Class A (with slides). I sold my TT and Class A first through a consignment dealer and bought months later. Both consignment dealers did not want any hoses left in the RV. I assume that they planned on selling those items to the buyer separately. I would ask your buyer if he wants the hoses as part of the deal. If not I would keep them. I kept the hoses in two totes (1 potable (a 10ft, 15ft and 25ft hose), 1 non potable (sewage and hose for tank flush)) in the RV and just moved the totes to my garage for the few months needed.
Mike