Not enough trucks for peak season. Felt like we were understaffed or the facility was too small. A few of the routes I had to work with needed to use Budget trucks which is a huge hassle (at least it gets you more hours). Expect an atmosphere full of frustration during peak season.
Not much of a con in my opinion, but some people might think it is: sometimes you don't know your schedule until the day of. However, that was made well-known to me before accepting the job, and in my case turned out to be more of the exception than the rule.
The appearance guidelines (clean-shaven, no visible tattoos, etc.) are a bit silly but not a big deal for a temporary job.