I used RV Trader to sell my MH.
https://www.rvtrader.com/rvs-for-sale
I use RV Trader to see what people are asking for like equipped and location MH.
You can also try local Craig's List.
For value I take a look at NADA and JD Powers.
https://www.jdpower.com/rvs
https://www.jdpower.com/rvs/shopping-guides
Low resale is what I would buy at. I try to sell by listing at High resale (for an excellent condition MH) but realize that I would probably need to lower my asking price to at least halfway between the High and Low prices listed.
I don't try to add-in all the options (most of the big items are already included).
Take some time to have really good photos to include in the for-sale listing.
Jim