Dry subgrade doesn't compact. That's not an opinion, it's physics. You run a 12-ton roller over bone-dry fill and all you get is a flat pile of loose dirt that'll sink the minute it rains. The water truck is what makes the whole compaction operation work, and if yours is sitting broken or you don't have one yet, the roller operator is on your clock for nothing.
We finance soil compaction water trucks from $50,000 up, new or used, chassis-and-tank as a complete rig or a bare chassis you're putting a tank on. B or C credit is fine. We close in about two weeks, which means your grade can stay on schedule instead of waiting on a bank's committee calendar. The whole deal runs off three months of bank statements for most tickets under $400,000.
Compaction watering is specialized work. The spray has to lay down an even, controlled moisture band across the full width of the roller pass, not a puddle and not a mist that evaporates before the drum gets there. The trucks serving this work are spec'd differently than a haul-road tanker, and we understand the difference when we're looking at the collateral.

