We had an area of low quality hardwoods that we wanted to keep in early succession with prescribed fire. There was a creek crossing that was problematic for equipment. We spent a few hundred dollars on a culvert pipe. It was the first project with the mini-excavator I purchased for habitat projects. It worked out well.
We used a dozer to put in our initial breaks, but once they are in, we just use a tractor with a heavy fire disk to maintain them. We hit them with the disk right before fire. When we burn large areas in the tens to hundreds of acres, we want to have a dozer on site. With smaller burns in the 5-10 acre range with good breaks, we don't have a dozer on site.