Do you plan to tow the trailer to the put-in or the trail head?
If not, you need to carry boats and bikes on the tow vehicle, not on the trailer.
I would not put any kind of rack on top of a Trillium. I would be concerned the fiberglass would not support the forces involved. Not only do you have the additional weight but the effects of wind as you go down the road. That said I'm sure the topic has been explored here in the past. You can use the google search feature to find threads on the subject. Welcome to the forum and please do post more pictures. Enjoy your "new" Trillium.
We kayak and there is no way I would put my boats on top of my camper. For all the reasons Raz stated and because it would just be to hard to get them up and off.
Most of the places we put the boats in the water you could not get a camper to anyway. Then when we get off the water we are down river from where we put in and I would much rather be close to my camp when we get off the water.
Happy Camping and Good Luck with whatever you decide.