I was curious if anyone would know what types of radios or frequency band would staff at a mobile home park use for communications like manager to other staff like grounds?
If the staff are using radios, you should try to get a good look at one of the radios to identify what they are using. The antenna tells the band they operate on so pay attention to the antenna on any radios spotted.
In an apartment complex I lived in several years ago, the management and maintenance guys were using Motorola CLS series UHF radios. I actually got my hands on one them briefly when I was in the office to drop off a rent check. The radio was laying around on a desk so I got to check it out for a few seconds while the staff was printing up a receipt for me. I'm already familiar with the radio (a business band bubble pack and a POS at that). I was already listening to them on one of the UHF itinerant channels so it wasn't any surprise.
For a small complex, FRS/GMRS and MURS are good places to start. If Part 90 analog business radios are in use, searching 450-470MHz is a good range to search. A larger operation is likely to be licensed so an FCC ULS search is also your friend.
If digital radios are in use, they could be Motorola DTR or DLR series radios on 900MHz. They will work well for a small to medium size complex and will work way better than FRS bubble packs. A large complex might be using DMR on UHF and they might be on a repeater.
There are lots of possibilities so you need to identify what radios are being used to narrow down whether VHF or UHF, simplex or on a repeater, and whether analog or digital. A little bit of RF detective work is required. I like doing this stuff. If it transmitting somewhere in the radio spectrum, I'm usually trying to find it.
Good luck.