Plenty of people have swapped a A for smaller MH (A, C, B), fifth wheel, TT. I think the first question you need to ask, and directed to your DW, is what she would be comfortable driving. Does she do well towing a TT, including backing into a site? One of the issues some encounter is how much storage space will you give up to store all your stuff. If you go with a smaller MH will it handle your current tow setup. If you go with TT will you also need to buy a new tow vehicle?
Good luck on your search.