Haven't even tried to put my bike in my Raptor.... Or my f350. Pretty sure it'd mess up the tailgate. How much does that Beemer weigh?
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Not unless you plan on parking it there & taking a lunch break. The ramps support some of the weight on the ground on the way up & in, I've had fully loaded up 4x4 Quad in the back before no problems, your fully dressed cruiser def weighs more, but I doubt by much, & the second that front tire hits the bed the weight over the tailgate is cut dramatically. I'd be more weary about damaging the bike to be honest those things are tippy & chromey & expensive all over. 4wd Quad? Totally different story - only thing I always recommend when it comes to 4x4 quads....back it in!!!! Only took 1 time not having it secured tightly enough & either parking brake gave or popped outta gear or both but on my last GM truck had it roll forward few inches coming to a stop light & the front rack kissed the 3 piece rear window & shattered into a million pieces lol - backing in never will happen tires press up against the cab.
To OP - wouldn't expect a 550-600 lb (guessing) bike to "weigh down" the truck at all in terms of feeling it in acceleration/braking - am impressed it didn't cause nose-high stance.....put some more miles/payloads on it & that may change - dunno, I have had 1000 lbs in bed before & it prob sat a tad nose high, you're only @ 1/2 the rated capacity though so really should be a piece of cake like it was.