I own a 2005 Zeppelin II Z191 and love it. I have had basically no problems and my floor is solid. The unit has a higher end feel with the nicer appliances, fiberglass frontend and propane cover.
The Zeppelin does have a bad reputation for soft floors though, especially the longer units with slides. I heard there was even a factory sold floor brace modification.
The problem with the freebie, is that it will be on you to dispose of it(probably not for free) once it is toast. Replacing the flooring is not an easy task when it will be needed. Plus there is all the other costs if you want to be able to tow it.
Someone wanted to give my then 10-year old daughter a "free" horse once too. for someone without a farm, free turns into $500 month in boarding fees + everything else.
Regarding disposal... I bet someone would take the biggest pos trailer if it had one working fridge or one working ac or even one useable tire.
^^^ Exactly what happened to my 2005 Keystone.
I replaced the cracked P-trap with a rubber one from home depot.
I had to remove the shower surround to access it. The whole repair probably took 4 hours (taking my time).