In my area there is a cul-de-sac with 5 houses, and a caravan parked where a house (now demolished) stands.
They are all travellers (all the same family). This cul-de-sac looks quite intimidating, and I have been told that few people are welcome there. I was originally approached by another member of their family to go go there to clean the windows.
Over two years later I still clean all of them, including the caravan, and have never had any problems at all with any of them.
Actually, I had my tyres let down by one of the children there a couple of months ago. The young reprobate's dad sorted that out for me (and the lad presumably), and we had a good laugh about it.
In other words, treat them with respect and they are fine.
John