450lb BMW lol my VTX is near 800. My KLX650 was ~330lbs and I never had any issues loading it on my hitch carrier on the back of the truck, but it wasn't quite that high off the ground (I'm 6'2" as well).
Some cinder blocks and a 2x12 on the ground to stand on and make you a little taller.
I bet you could weld a little something on the back of that carrier, use one of those tri-wide loading ramps for 4 wheelers (so you could use your feet) and then just ride the bike on to the carrier.
I can't imagine using a winch. Then you have to use half a hand to run the winch remote and then you have 1.5 hands to control the bike.
I ride into my toyhauler. Unloading I leave the bike off and in 1st gear. As soon as the rear tire gets out of the trailer and onto the ramp I drag the clutch and use the front brake to control my speed. Front brake alone and the front slides (and I don't want to lift a foot for the rear). I know some BMWs had the integrated braking so the front applies partial to the rear (K1200GT)...
2005 2500 Cummins/48RE/3.73, QCLB, 4wd, BigHorn, Edge Juice w/ CTS + Turbo Timer,Transgo Shift Kit ISSPro Oil and LP pressure gauges, GDP 20/2 filters, Custom Diesel Steering Box Brace
'10 Forest River Shockwave Toy Hauler 21'
Honda EU3000I Genny