I was seriously considering this. Law wise, yes, you've got issues if you try to hang the whole thing out the back of the bike, not to mention how many numptys would simply hit you while gawking.
Realistically, you'd need to use the pillion area as well, either mounting it from there back, or perpendicular to the bike across the pillion area (this was my plan and I have 2 fork mount brackets). To get under the width laws, it's 500mm from centre line for permanent attachments, note permanent. I figured removing both wheels and mounting either side in a triangle support of the frame, the frame length would only be around 1.2m, which is about 100mm each side of my panniers, no major.
Other option is mounting down the side of the bike, seen this done with surfboards for example. I ruled this out as I didn't like the idea of the mtb bike being on the side of the motorbike.
Beyond that, you have to think logistics. You're going to wear mc gear to and from, have to carry mtb gear, hydrabak or bottles etc. When you get there, you need to switch and have space to store the mc gear. I also didn't fancy the idea of pulling on mc gear when hot and sweaty from mtb'ing (same basic reason I drive to and from Paeroa as I'm a flag marshal).
In reality, with the extra gear I take mtb'ing (workstand, toolbox, spare bits and bobs) the odds of using the motorbike looks kinda slim...
Did a trip in January to the South Island, where I went the opposite way. I loaded the van with motorbike, mtb bike, all the gear for both plus work gear...
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