My Guru is ok on the gravel. Not great, but there were some packed sections, where I get a reprieve and it is flat. Also not going more than 10-11 mph. As long as there is no sand, I am ok. We did not know about the dirt parts!
Will be ordering the rest of the parts for my Ariel on Wednesday, so they will be there Saturday, when we get home. My plan is to ride it to work the first Mon or Tues I am back and then hit the Battle Road Trail in Minuteman National Park on Wednesday. It’s packed dirt.