As others have said, a non threatening manner is definitely required. Here in Central Tx, everyone is pretty much armed. Private property is the rule, and most people are very protective of their property. I’d try to stick to the back roads and try not to cross anyone’s property. As a rural resident my entire life, who commuted to Austin for work, most rural folks are already suspicious of crazy city people 😃Having said that, regarding bartering, myself and most of my neighbors would probably offer help without expecting anything in return. Again, how you present yourself and act towards them will determine how you are treated. It certainly is respectful to offer something in return for a kind deed, you’ll typically get a lot of return on a simple Yes sir, No Sir, Thank you Ma’am.