Plenty of rope

He was good with rope.  This was not the first time he tied muscular guys up.  He knew how to mobilize their arms and movement would inflict pain.

The cleaning rags, hanging out to dry would make effective gags and blindfolds.

Shirtless, the ropes would grate their skin like sandpaper.

They would be helpless.

When he had bound their wrists and arms and roped their chest and guts, being gagged and blindfolded, he dumped them into...

...their own truck, bound their ankles at their work boots, and drove them off.

The stanchions would be perfect.  They would use them to secure the boys.

They pulled Billy out of the truck, and dragged him, chest down in the dirt to the pole barn.  They untied his feet, put him upside down, and spread his legs wide, binding his ankles to two support beams.  Hanging inverted, his sweat dripped to the ground.  His arms and chest, scrapped raw from the ropes, trickled blood mixed in the sweat.  

With Ryan stretched out next, they began to video his torment.  It would be good motivation to get the ransom paid quickly.  Waves of pain came from his groin.  His gagged moans made it more urgent.  They kicked him in his belly.  He gasped.  For a short while he choked, then he was silent, whimpering, glistening with  sweat.

Dustin just hung, silent, braving his fate.  The roped made his skin itch, even tickling his belly in spots.  He kept his focus, trying to avoid going out of his mind.

The three hung there through the cold night.  It was the next day, 24 hours latter, that they were rescued, the 3 million dollar ransom paid.