I believe you can identify the reason you can't sell the MH (owe more on it than you can get for it, MH has issues, etc.) without violating the rule about advertising/selling.
The question is why don't you like it? Is it a basic dislike of a MH? Or is it particular features (size, floorplan, etc.)? Does it stop you from being able to take it out? Or do you just have to make concessions when you go out (having to make the dinette into a bed each night)?
If it's a basic dislike and/or you can't do the things you want with it, then you should re-look at how you're trying to sell it. Maybe you'll have to take a loss on it - at this point, if you're not enjoying it, the money is a loss anyway.
If it's about specific features and/or concessions, then look at how to minimize those issues. You might be able to change out some features (change a dinette to a couple recliners, etc.) or you might be able to change your habits to fit (kitchen too small - bring a grill and cook outdoors).