Currently have a 2003 Chevy 1500 4x4 with a six foot bed. It has a tool box so the bed is more like 4 foot. I also have a 10 foot single axle open trailer with high sides that will hold like 3-4 yards of mulch. Four yards is really a load on this thing and I'm sure I'm overloaded. So I've started to have questions about safety. I'm pretty happy with the size of my open trailer as it hold all my lawn equipment cause I'm solo for the most part. I would love to haul big loads of mulch, brush, whatever and still take my lawn equipment on the trailer. If I move up to a 2500 with a dump insert, how much mulch/weight can I safely haul with a dump insert and still haul my little trailer?