I'm still surprised at all the little guys I see running around with trailers loaded past capacity with bulk mulch. Most large companies have bean counters who realized long ago that bulk is not the way to go most of the time. You can get bagged mulch for only about $10 more a yard here in central Texas and other areas are pretty similar. If you do the math on your labor expenses you will easily see that bagged mulch will save you money and not kill your workers. Bulk mulch here is about $18 per yard and bagged runs about $28. It is a whole lot easier to use move mulch around a jobsite when it's neatly packaged for you. You should cover the gap in increased material cost by your savings in labor costs. Plus if you have any left over mulch you get to sell it to someone else. You have to use up bulk mulch because it's not cost effective to bring it back to your shop. I usually end up with hundreds of leftover bags of mulch a year that end up getting sold a second time. My small company uses 5,000 - 8,000 bags a year and we have mulching down to a science. We mulch a lot of yards that require 300 bags. I have a custom made 21' triple axle gooseneck (4' solid sides) with a split ramp and two side doors for side loading the front of the trailer with a forklift. The trailer will hold 390 bags loaded. This puts the trailer weight at about 23,500 lbs. You need a dually with airbags on the axle to pull this kind of a load. Every property is different but you can usually do 14-18 bags (630 lbs - 810 lbs) per man hour on a big job. This bags per man hour number includes unloading the mulch, moving it where it needs to go and doing any bed prep along the edges of the bed. We use a 1500 lb capacity dolley and Brentwood wheel barrows with dual front tires at the jobsites.