Forgive me if this question has been asked to death... (and please
feel free to point me to any archive areas to research previous
responses as necessary)...

My wife and I recently purchased a new Rockwood travel trailer
(Model#: 1910) that we tow behind a 2006 Mazda MPV.

We've just enjoyed our first family weekend away in it, and the whole
experience was fantastic, but I'd love to be able to take our family's
bikes along on the next adventure! I've seen a number of trailers with
different types of bike racks fitted to the top of the trailer, and
would like to add something similar to our own trailer (4 bikes in
total - 2 adult, one kids (20" rims) and one toddler bike (12" rims +
training wheels!).

I'd really welcome any advise that anyone may be able to offer re:
sourcing of such a rack (we live in Southern Ontario, therefore
ideally Canadian-based vendors/retailers would be preferred), and also
pro's/con's to consider regarding trailer handling or compromised
structural integrity through use of these devices (if general
conscensus suggests "bikes on top of trailer = bad idea", then please
feel free to suggest possible alternatives?).

Your suggestions & recommendations will be very much appreciated.

Cheers!