I'm in the "no sticker" camp. On my vehicles, the first thing I do when I get them home is remove all dealer markings. I used to put Texas A&M stickers on my cars back in the day (well, just one, on the rear windshield). I didn't have anything on my new truck for the longest time until DW put one on my back windshield on the sly. It's really small though, so I'll let it go.
Unfortunately, now that I think about it, my trailer has 2 dealer markings on it that I've gotten so good at ignoring I don't even see them any more. I bet if I take them off now, the finish will look different. It's been 3 years.
So, definitely no sports teams' stickers on the trailer. If I put one on, it would be a small Texas A&M sticker on a window somewhere.
It's not that I think they're "tacky", I just don't like to stand out. I would rather someone see me drive by and be so unremarkable that they immediately forget they saw me. Anonymity is a very effective defense.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!