You get all sorts of travellers, just like 'normal' people.
We had a temporary encampment on a cyclepath near us, yes they made a bit of a mess over a couple weeks, but you could (well i did anyway) cycle through the path , nod and say hello, they responded in kind.
Equally we had an encampment on fields nearby....bloody hell, the youngsters (early 20s) were just gagging for some aggro if you even made eye contact, just vile people.
Treat them with respect, they kinda respond in kind.
But, if they're 'working', watch em. Collecting scrap locally, they know every trick in the book, offer to clear your garden (well not mine anyway) of rubbish, they'll take what they want (anything metal)then hightail it leaving the real rubbish. Happened to me years ago when i was young and naive, happened to my next door neighbour last week.
Again, on the flip side, we used to get them coming in regularly to collect scrap from my last employer. Polite (if a little pushy)...but accepted a no, equally gladly accepted anything you did have.