Like selling anything else, some details would be helpful when trying to sell the set.
Brand?
Color?
Size? (is the washer or dryer or both super capacity?
Age? (I know providers lie about their age but people buying appliances want the truth.)
Are these on a ground floor or upstairs?
Lastly, this is mainly a vagina vending site, the best place for selling appliances is Dallas Craigslist.