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Interesting...I've been trailering bikes for about a half a century and lowering the center of gravity (6" ) never even entered my mind as a consideration. For me, the partial compression of the suspension with a tie-down that has been rigged not to come off on a bump is perfect.BMW has printed tie-down instructions in recent owner manuals, and they generally agree with their instructions I have in the owners manual for my BMW Multi-Trailer.
The goal is to keep the center of gravity of the bike/trailer combination as low as possible and this is accomplished by compressing the bike's suspension as much as possible. The usual instructions are to loop straps around the handlebars just either side of center and then to add rear straps at the rear footpeg mounts. This is a little difficult with an R100RT unless you can temporarily detach the fork boots glued to the fairing. Yes, not on the centerstand and not on the side stand.
You hear all kinds of silly recommendations, but it should be obvious that a bike still bouncing on its suspension is not tied down securely. And, your bike came in a crate from the factory with the front suspension completely compressed, so you can ignore the legends that this is somehow a bad thing. It simply isn't.
I'm sure some experts will be along with some tricks. Generally speaking, you won't put the bike on the centerstand. You'll need to have the front wheel into some kind of chock or at least something to strongly hold it down with no ability to walk sideways. You want soft tiedowns...usually these are a short piece with a loop of webbing...this goes around the frame...the other end is a hook. The other part of the tie downs have the mating hook along with ratchet to tighten things down. Two tie downs go around the lower yoke of the front forks, pulling forward and downward...must compress the suspension probably 1/2 way. Two more tie downs pick up a nice frame point on the aft end of the bike that pull down and slightly backwards.
Here are some past threads:
https://forums.bmwmoa.org/showthread.php?29686-proper-tie-down-technique-when-trailering
https://forums.bmwmoa.org/showthread.php?6221-Trailering
https://forums.bmwmoa.org/showthread.php?11822-Trailering
Update: More info https://forums.bmwmoa.org/showthread.php?88430-U-Haul-motorycle-trailer