At first glance at the pix out side the fence your hack looks like a refrigerator laying on its back side.
Looks like you are making every spot count w/ the blue LP tank.
Maybe its just me but that out fit looks a bit heavy for the bike. What to you think it weights out at?
If the box had an angle point on it could that lessen some of the pulling.
Thinking that even at 30ks the wind would push an angle a bit more to the right.
Could lessen the tire wear a bit as well.
You are indeed one lucky fellow to have a Lady who rides & works on her own sidecar.