I have a light wt aluminum hitch hauler for my ktm 300 (230 pounds). A long way from the weight of a gs800. It does well, but have seen the versa haulers haul heavier bikes. I would imagine your hitch can take the weight but the front will likely be lifted due to the rear sagging. I had a cap on my truck and could not open the rear window...it hit the bike. That may vary depending on how far the bike sits away from vehicle. I personally would be too worried to have that much weight/$$$$ on a hitch hauler. But to each their own. I sold the cap and now use a back flip tonneau that I fold up when hauling the bike. Works well.