I have a after factory "house" Mini split heat pump installed in my Pusher

2007 Alfa MDE, I have a 16K BTU Mini Split system installed. The compressor/condenser part is bolted/strapped in aft of my radiator. The evaporator/air handler is installed where the original unit was.  I'm not saying this is good or bad but, I'm not comfortable with it. I'm not sure what the original unit looks like. I have not found any advertising/media to help me find a solution to replace it. I read somewhere the unit I need should be 2 ton plus. Or somewhere between 20 and 30K BTU. I'm a retired office worker so everything is new to me and this is my first BA pusher. And Hi! this is my first post...