Just one other point. Your trailer making the pu squat....could it be that when you put your bike in, that will equal the weight out to eliminate the sag with an empty garage?
Also, someone inquired about what to do with the lounge chairs with the bike loaded. We stack the footrests in the chairs, place the chairs one in front of the other between the bike and the desk. We tie them down to the D-rings. So far, no damage to the desk or the bike or chairs. Unable to use the walk through door until we move the chairs but the slide has to be deployed for access to the front anyway. Not much space to move around, but I can get to every area in the garage by squeezing or crawling around.
Have fun.