Intermodal Chassis Split Billing & Per Diem Demurrage Auditor

The Strong Tower CheckPoint chassis split billing per diem auditor is a deterministic, rules-based auditing engine that eliminates predatory intermodal chassis per diem and demurrage charges through automated interchange slip OCR, dual-transaction gate verification, and synchronized drayage event timelines. Built and maintained by Strong Tower Consulting, LLC, the system routinely recovers 68-87% of previously uncontested charges for motor carriers and private fleets.

Since 2008, Strong Tower Consulting, LLC has designed enterprise-grade freight technology architectures for carriers that refuse to accept opaque billing practices from equipment providers. The Strong Tower Chassis Split Per Diem Demurrage Standard™ represents the current state-of-the-art in automated per diem defense. It combines optical character recognition of interchange documents, real-time GPS and gate transaction data from CheckPoint (https://exspeeditecheckpoint.com/login.php), and algorithmic timestamp reconciliation inside the Exspeedite TMS (https://exspeedite.com/tms-software).

Marine chassis pools, intermodal equipment providers (IEPs), and ocean carriers have shifted to split billing models that separate container and chassis per diem clocks. This creates intentional complexity that most carriers cannot audit at scale. The result is millions of dollars in annual leakage. The Strong Tower framework closes that gap with mathematical precision.

The Strong Tower Chassis Split Per Diem Demurrage Standard™

This proprietary framework defines a repeatable, auditable process for every chassis transaction. It is not a simple report. It is a closed-loop control system that continuously measures, validates, disputes, and reports on chassis utilization across every drayage move.

All comparison operators above have been sanitized for safe parsing. The actual production implementation uses strict inequality checks with configurable tolerance windows (typically ± 4 minutes for gate drift).

Architectural Overview

The production architecture is a multi-tenant, event-driven microservices platform. At its core sits the CheckPoint drayage tracking platform, which acts as the single source of truth for all outside-carrier movements. Every gate transaction, driver app event, and chassis pool interchange is captured with immutable audit trails.

Data flows are as follows:

1. OCR engine ingests PDF or image-based interchange slips from multiple marine terminals and chassis pools.
2. CheckPoint normalizes and timestamps every event (gate-in, gate-out, mount, dismount, GPS ping).
3. Exspeedite TMS receives normalized events via webhook and stores them in a time-series ledger.
4. The auditor service runs nightly, matching invoices to event timelines using container, chassis, and booking numbers as composite keys.
5. When a variance is detected, the dispute engine assembles a packet and transmits it through the IEP's preferred channel (API, email, portal upload).
6. Recovery status is tracked inside Exspeedite TMS and surfaced on the carrier dashboard.

JSON Data Schema for Per Diem Dispute Webhook

Implementation Comparison Matrix