Great videos. I would imagine the trails and "roads" are impassable during and after a heavy rain.
You indicated that your project involves road construction. Are you on a foreign aid grant to improve roads? I was curious why you are in Haiti.
People I encounter usually go there for missionary or disaster work.
The towns look incrediby impoverished. Delete the covered vehicles and tin roofs and you could be in the 19th century. Familiar with the country's history. I have never been there. Not many ride reports focus on Haiti. Therefore your pictures are an insight. We in the USA only see and hear about tragedy there.
Thanks for posting.