ki0eh, it is hard to carry anything heavy on a DR mower. The front , blade guard area, is balanced to make it easier for the operator. Also, that area pivots for uneven terrain. One bag of sakrete is way too heavy to maintain that balance. I had an attachment to carry a light chainsaw in the front of the blade guard. Even at less than 20 lbs. ( including extra gas ) it threw the balance off, but still manageable. I did make a "mule" to carry any material to the site. This was an old riding lawn mower frame, motor, transmission. I built a frame work over top of the motor out of 1 1/2 inch angle. This way, I could strap down any material and use the motor to move it along. I had a steering arrangement similar to a wagon. A simple handle hooked to the steering linkage of the mower. With a little know-how, I hooked the clutch and brakes into the handle. When the handle was dropped, the brakes came on and the clutch was dis-engaged. It carried about 300 lbs along the trail and nobody broke a sweat.
The sakrete might be an extreme case (it wasn't going far), but I've seen people rig up tote carriers for the DR's, wonder if any of those folks will be around to share their experiences. The mule sound like a good idea, but I'm not handy enough to rig up something like that. Land managers seem to come up with more and more rules too. Would love to see pictures of the mule though.