Unfortunately, most airlines will not accept responsibility for "wear and tear" of checked baggage. At Chicago O'Hare, several airlines post signs telling passengers that they should EXPECT some damage as a result of checking luggage. Things like torn zippers or zipper pulls, scratches, dents, dings, and tears are to be EXPECTED!
Because of the restrictions on carry-on now, you'll probably have to check strollers. I would ask when you check-in if they have any boxes that might accommodate your stroller. You can also ask that your item be tagged FRAGILE. I don't think that will stop some of the "gorillas" that load/unload the baggage, but maybe someone will take note and try to handle it with a little care.
Another point the airlines make (and this is kind of valid): they can't be responsible for turbulence during the flight and often some, but not ALL, damage can occur because of that. But I have seen some baggage handlers treating luggage like they were on a basketball court! No excuse for that. As my dad said, you pays your money and takes your chances.