Might cost a bit, but if you have a trailer already, buy 4 upright roof rack type carriers and mount them either directly to your trailer. Alternatively, build a platform that fits your trailer and has the carriers mounted on it that is removable, so you can use the trailer for other purposes.
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Originally Posted by colorider
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
You can always make a frame out of 1" pvc tubing. I've seen designs on the net lately, but can't remember where right now. Basically, it's a frame that you set the bike into (on either side of the tires), and then you bungee cord them in. I think I'd only suggest it on a trailer with sides, but if you're looking for cheap, it may be the way to go.