Loading a Uhaul trailer in apartment complex.

I live at a townhouse complex that essentially has equivalent parking to that of an apartment complex, meaning designated spaces. Typically every spot in front of my house is used by my neighbors. Should I try to find a place down the street with less vehicles and dolly my boxes and mattresses there?

It'll be a 5x11 or 6x12 trailer and I honestly don't think I'll be able to back it in with such limited space.

Should I just pull in directly behind my neighbors and pack quickly?

My neighbors are pretty much antisocial or old, so I don't like the idea of asking them to move their cars.

The only thing I'm nervous about is trying to find a spot to load up our stuff or attempting to back the trailer into our spot.