Call them first!! If they had a fork truck, you can slide the 2 lifting straps on each fork, pick it high enough to fill and the loader can dump into the bags....then load them on the trailer.
Understand they are NOT in business for your convenience, so thinking that they will be able to 'play sandbox 101' with you is an unrealistic expectation.
I've done super sacks for 2 years now, and it isn't as much fun as you might think. I have a fork truck, bagger, and a large tractor to load and unload.
If you think you have 'bag enough' to hold the bags in position while the 6 yd bucket hurls 3 ton at you, you have been smokin' some funny stuff.
They will fold inward and you will be buried under coal and smooshed bags.
Steve at Blashak has built a beauty of a bulk bag filling station. Other than that, I'm going to pee on your parade.
Buy it bulk...or bagged, don't count on them being set up for your request.
The bag filled weighs one ton, and we put a pallet under each bag to keep them stable during transit. We also have pallet jacks for difficult area.....
A fork truck or tractor will move the pallet and sacks, but we also have noticed the ease with which you can punch a hole in the sturdy bags.
$20.00 a pop, so do your homework, and don't expect any special favors.
Are They nice? Sure, but 40 or 50 pounder's make the job very user friendly.....machinery friendly, and storage friendly. The ball is in your court.....don't fumble it!