All the bits and pieces

Hi everyone,
we have just purchased a hard floor Cub Spacematic which we used last night for the first time. It is not an off road unfortunately.
I am hoping someone might have some ideas for us as we are looking to add a few bits and pieces to the camper without too much cost if possible.
Currently the camper has a short drawer bar on it with a gas bottle holder and tool box, both of which sit without too much space when winding the winch. It has 13 inch tyres on it.
What we would love to do is carry a boat on top, originally when I asked Cub they suggested that we only carry a small tinny, preferably under 50 kilos, we did want to carry one a bit bigger. Also I am wanting to put a bike or two onto the camper, I am presuming because of the small tow bar space we would not be able to fit my current bike carrier on it. I had thought perhaps I could get an attachment at the back of the camper for a tow bar, cub suggested they have one which would cost over two thousand dollars, a bit too much I think.
My husband would like to put a stand up bike rack of some sort on the top of the camper to mount the bikes and then put the boat along side it on some extra supports. I still think a bike rack at the back may be better.
We are a family of six. We tow with a Toyota Land Cruiser.
Any ideas or suggestions would be greatly appreciated.
I look forward to lots of replies.
Thank you
Chris.