Attaching bike carrier to trailer/caravan

I don't know of any reason why you can't have an attachment on the rear of a trailer, Caravans have them so what's the difference in your opinion, secondly if your going to make a carrier on the rear it needs to be strong, no movement AT ALL, we had some tourists from down South here last year and they lost 2 bikes of the back of the van, quite often I see carriers rocking back and forth while travelling, if a carrier can move then the point of flex will be the place the metal will fatigue and crack, you can make a good strong carrier but what you fix it to needs to be strong too,

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We have our spare mounted flat on the A frame with a steel shaft welded that comes up through the center of the rim the bike carrier then slots into this,whatever you do use tie down straps to hold the whole lot stable or they will end up as road kill.
Good luck Vic

Garbage

here are a few pics of the set up that i made myself.has had 2 adult and 2 kids bikes on it and it travels well.Image Could Not Be Found Image Could Not Be FoundImage Could Not Be FoundImage Could Not Be Found

as long as the bikes dont stick out 1.2 mtres (1200mm) from the rear of the trailer you'll be right,hope these pics gives you some sort of idea,cheers.

If you want to ride your bikes mount them on quick release fittings on top of your hardtop. There is more chance of them getting clean air up there.
We are bike riders & won't put our bikes on the back of any vehicle. It is a good way to wreck them.
They pick up way too much dust & grit out there.
If you just want to take the excess weight with you to make your rig look the part just mount them on the back. Don't waste any money buying anything that you might get real satisfaction out of riding though. It is only going to be good for a few rides.
Quick release clamps are about $45 each. Our bikes did 10,000 k around SA & NT inside our patrol wagon mounted on quick release clamps last year. Always safe & secure.
We have ridden over 5000 k since.