There are several guides for easer island (Green Meadows area), but they all go up to bridge 5 only, bridges 6, 7 and 8 are not covered. I have completed these bridges and decided to share my solutions in this guide. Note: I didn't try to optimize budget for the bridges, I was happy as soon as trucks / bunny could pass it (preferably without the bridge breaking down).

For solutions of all of Green Meadows bridges see guide by Captain Picard:
https://steamproxy.net/sharedfiles/filedetails/?id=694106556