Workamping for Amazon, volunteer.gov, usajobs.gov etc.

I have a general question for all you workampers out there. Have you ever had a workamping position anywhere contact your current employer? Please share your experiences. I am planning on going full time next Summer, but I have not yet told my current employer. It would definitely come back negatively on me if my employer were to find out about my plans early. And it would definitely decide where I'm planning on applying and when.

I'm looking at Amazon, volunteer.gov positions, beet harvest positions (obviously not applying yet), and possibly usajobs.gov positions (which I expect would contact my employer, since they are paid positions). Yellowstone jobs and mom-and-pop campground positions.

Also, if they do contact current employers, how do you fulltimers do it when you're hoping from (seasonal) job to job? A Volunteer resume?

Thanks for any information!