I used to list homes on Zillow and FB marketplace but quickly got tired of dealing with the tire kickers and unqualified buyers so I started using a realtor. I had 13 homes to sell and you only have 1 so it might be fine to just have your manager do the showings and you list it online. I have all singlewides except for one double wide which is on an unnecessarily large lot even for it’s size but I don’t have them paying a higher rate.
I use craigslist for the cheaper homes ($10k or Less) and I use a Local MH dealer for everything else. I usually pay about $6K in commissions for each home.
I base my lot rents on the size of the lot not the size of the home. We are renting land after all.