 
Check out my pit set up. The trailer awning is 20×11 feet. Two bikes fit nicely under the awning and three would be fine. I also have a 10×10 EZ Up.
The trailer is set up to haul three bikes plus wheels, riding gear and all the other stuff you need at the track. Four bikes and stuff fix with a little extra work and five bikes and all the stuff is the record for this trailer.
At the track the trailer makes a nice changing room. All of this is included when you hire EDventure Racing.