For those towing RVs, has anybody upgraded the factory speakers. I have 4 (6.5" I think) ceiling mounted speakers with a Genesis system in my Puma TT. Seems pretty common. I'm wanting to replace the factory speakers because...well they pretty much suck. I'm worried a little about mounting depth. Any experiences you'd be willing to share before I start tearing into my ceiling? I thought this would be a common upgrade but can't find much info out there.