i had a look at a mo-tow and did a trial fitting on my Scout and all looked good, the platform is about 25mm per side wider than my 4wd, so i bought one..
the one i bought didn't come with any lights so i've fitted some, plus another rear plate. the YZ sits in the channel nicely and it's easy to load up. once loaded i really couldn't even tell it was on the back, but then the Scout's rated to tow 3200kgs so a 15kg mo-tow and a 95kg YZ would weigh less than a full tank of fuel, even with extra the leverage ratio due to my bike sitting about 450mm out from the back.
after the test fitting and installing the extra lights, i loaded the bike up again using my fork seal saver, some ratchet tiedowns plus an okky strap to hold the back wheel down into the channel and the bike was very stable with no side to side movement at all. although i'm thinking of adding an extra rear strut brace from my towbar mount to one side of the mo-tow incase it rocks too much side to side over bumpy roads, but anyway we'll see how it goes first time out..