Cabtherlyn Trailer Document Holder — 8-Pack Aluminum Tube with Rubber End Caps, Weatherproof

Cabtherlyn Trailer Document Holder is a weatherproof aluminum tube box with rubber end caps and cables that secures registration, insurance, and permits on trailers and trucks.

Built from corrosion-resistant aluminum alloy and clear acrylic, this tubular document case stores important vehicle paperwork where it’s easy to find but protected from road grime, rain, and salt. The 1-5/8" diameter tube measures 9-7/16" long and includes rubber end caps and mounting cables so you can attach it to a trailer frame, tongue, or bulkhead. Sold in packs of eight, it’s intended for fleet use, multiple trailers, or for owners who keep paperwork with each trailer they operate.

How does this holder protect documents in bad weather?

The holder uses a snug rubber end-cap seal and a solid aluminum tube to keep moisture, dust and debris out. The acrylic component lets you identify contents quickly without opening the tube, while the alloy resists rust from road salt and wet conditions.

• Rubber end caps form a tight, water-resistant closure
• Aluminum alloy resists corrosion from salt and moisture
• Acrylic window or cap allows fast visual checks without exposure
• Cable mounting keeps the tube off the ground and secured to the trailer

Will it fit my trailer registration, insurance, and permits?

Yes — the interior length and 1-5/8" tube diameter accommodate standard folded registration papers, insurance cards, and small permits. Its compact, cylindrical shape is designed for documents folded or rolled to fit inside and keeps them flat enough to be legible when retrieved.

• Internal usable length: approximately 9.7 inches for folded paperwork
• Tube diameter: 1.57 inches to fit cards and folded documents
• Suitable for registrations, insurance cards, DOT permits and similar papers
• Small enough for trailers, trucks, utility vehicles and some motorcycles

How easy is it to mount and use daily?

Mounting is straightforward: thread the supplied cable through the tube and secure it to the trailer frame or tongue using common fasteners. The rubber caps pull off for quick access, and replacing them restores the seal so documents stay protected during travel.

• Includes rubber end caps for tool-free daily access
• Steel cable mounts allow flexible placement on the trailer
• Lightweight aluminum design won’t add significant weight
• Compact footprint preserves cargo and hitch clearance

What makes the Cabtherlyn design practical for fleets or multiple trailers?

Sold as an 8-pack, these holders make it easy to standardize document storage across a fleet or multiple trailers. Durable materials and simple mounting reduce replacement frequency and keep paperwork consistently available where inspectors, drivers, and owners expect to find it.

• Eight-piece pack for fleet consistency or multiple trailers
• Durable construction lowers long-term replacement needs
• Uniform size makes storage and retrieval predictable for drivers
• Works across trailer types: campers, horse trailers, utility trailers and more

Who is this for? The Cabtherlyn Trailer Document Holder is geared toward fleet managers, owner-operators, and trailer owners who want a simple, durable place to keep registration, insurance and permit papers with each trailer. If you need quick access to documents that must stay readable and dry while the vehicle is in use, this compact aluminum tube provides a stable, weather-resistant solution that mounts nearly anywhere on a trailer or truck.