Yea +4 that at $100/yd price point you''ll probably not win the bid...or get a chance for another bid unless you know the guy. That is astronomical'y high even for my area. Tpendagast's post about the math is what you need to sit down and figure out..WHAT IS THE TOTAL cost to the business? SKID steer and spreaders is the general way...but opens the door to a lot of liability issues with the skid steer causing damage. I WOULD rather tackle the job with 2x rental stake bead truck, and 6 guys with 4 brute containers. Drive to each island, two guys in the bed loading up the containers, and 2 guys disbursing the containers to the island, and the other 2 guys fine spreading. While one truck is being unload the other is getting loaded up at the mulch yard. and can keep that process cycling THIS also would avoid an over purchase of materials should your net material amount be less than your initial estimate/bid. In my experience the skid steer approach works better when the islands are large and open or limited labor. a 6x man crew is about $1,000 a day cost where as a skid steer is highly variable depending on rental, re-fueling and insurance covereage along with drop off and pick up... Which is more productive? you'll have to make that call based on the terrain and how fast you need the job completed.