Improper loading and strapping is responsible for more cargo losses, trailer accidents, and property damage than any mechanical failure. The physics are unforgiving: a hard braking event or a sharp evasive maneuver creates enormous forces on an unsecured load, and what was sitting stable on the trailer deck suddenly becomes a projectile. This guide covers how to load and strap correctly every time.
Weight Distribution — The Foundation of Safe Loading
Before you think about straps, think about where the weight goes. Incorrect weight distribution causes trailer sway, understeer in the tow vehicle, and handling that's fundamentally dangerous at highway speeds.
The 60/40 Rule
Place approximately 60% of the load weight in the front half of the trailer (the half closest to the hitch) and 40% in the rear half. This ensures positive tongue weight — the downward force at the hitch — which keeps the trailer tracking behind the tow vehicle.
If weight shifts too far back:
- Tongue weight goes negative — the trailer starts to lift at the hitch rather than push down
- The rear of the tow vehicle lightens up, reducing rear wheel traction and steering control
- The trailer develops pendulum-like sway that gets worse as speed increases
- Catastrophic trailer detachment becomes possible at extreme imbalance
Left-Right Balance
Loads should be centered side-to-side. A load that's heavy on one side tilts the trailer, creates uneven tire wear, and causes the trailer to crab slightly — the wheels don't track straight, which creates handling problems and accelerates tire wear. For enclosed trailer moves, alternate the placement of heavy furniture pieces side to side.
Heaviest Items First, Lowest, and Forward
Load order: heaviest items first, placed lowest and closest to the nose of the trailer. Appliances, full dressers, machinery, and heavy boxes go in first. Lighter items stack on top and fill toward the rear. This sequence ensures the heaviest weight is forward and low — the best possible combination for stability.
Understanding the E-Track System
Our enclosed cargo trailer is equipped with E-track rails — horizontal aluminum channels with slots that accept a variety of cargo accessories. If you haven't used E-track before, here's how it works:
- The E-track rail has evenly spaced slots along its length
- E-track fittings (available separately) snap into these slots and lock in place under load
- Common fittings include: single-stud, double-stud, and strap loop fittings that accept standard ratchet strap hooks
- To install a fitting: align the fitting's hooks with the E-track slots, press in, and slide down until it locks. You'll feel/hear it seat.
- To remove: push up and out
E-track lets you position strap anchor points at exactly the right location along the trailer for your specific load — rather than being locked into fixed D-ring locations. This flexibility is especially valuable for loads of varying sizes.
Ratchet Strap Technique — Step by Step
Ratchet straps are the standard load securement tool, but they're misused constantly. Here's the correct technique:
Choosing the Right Strap
Ratchet straps have a Working Load Limit (WLL) — the maximum load the strap is designed to restrain. Use straps rated for at least the weight of the item being secured. Never use a strap that's frayed, has damaged webbing, or has a bent or corroded ratchet mechanism.
Loading the Ratchet
- Open the ratchet: flip the pawl release and open the ratchet to its fully open position
- Thread the free end of the strap webbing through the ratchet mandrel (the slot in the center of the ratchet wheel) from bottom to top
- Pull the webbing through until you have a few inches of slack — not enough to be loose, not so much that excess strap flaps freely
- Hook the ends of the strap to your anchor points (D-rings, E-track fittings, tie-down rails)
- Pump the ratchet handle to take up slack and tension the strap. Each full stroke of the ratchet takes up approximately one inch of webbing.
- Tension until the load is firmly secured — no movement when you push on it. For large furniture, slight compression is fine. For rigid items (machines, vehicles), snug tension without overtightening.
- Close the ratchet handle against the body — this locks the mechanism. The strap cannot pay out when the handle is closed.
Strap Routing — Critical Details
- Never route straps over sharp corners or edges. Sharp edges cut webbing under tension. Use edge protectors (available at hardware stores) or fold a rag or piece of cardboard over the edge before routing the strap over it.
- Avoid contact with heat sources. Straps near exhaust pipes or hot engine components can be damaged and weakened.
- Angle straps appropriately. A forward strap should angle forward from the load to the anchor — this provides forward restraint (critical in braking). A rear strap angles rearward. Lateral straps control side-to-side movement.
- Don't cross straps over each other at high tension. The crossing point concentrates wear and can damage the webbing.
D-Rings and Structural Anchor Points
D-rings are fixed anchor points welded or bolted to the trailer floor and walls. They're rated for specific loads — often 5,000 lbs or more per ring. Our enclosed trailer has D-rings on the floor for heavy, low loads that benefit from downward-angled strapping.
Use D-rings for:
- Machinery and equipment that needs direct floor anchoring
- Vehicles on the car hauler (wheel straps anchor to D-rings)
- Any load where the strap needs to pull straight down or at a low angle
Never attach straps to trailer body sheet metal, wood decking screw holes, or non-rated metal brackets. Only use designated tie-down rings and tracks.
Moving Blankets — When and How to Use Them
For moving furniture in the enclosed trailer, moving blankets serve two purposes: they protect finished wood and upholstery from scratches caused by strap contact, and they cushion against furniture pieces contacting each other during transport.
- Wrap furniture corners with blanket before strapping over them
- Place blankets between furniture pieces that are stacked or loaded adjacent to each other
- Blanket-wrapped furniture can be strapped more tightly without surface damage
- For mirrors and glass: blanket on both faces, then load vertically against the trailer wall with additional cushioning on each side
What NOT to Do — Common Mistakes
- Never tie to bumpers, plastic body panels, or accessories. These are not load-bearing attachment points. They'll rip off under load.
- Never use bungee cords as primary load securement. Bungees have almost no working load capacity and provide elastic, unpredictable restraint. They're appropriate for holding a tarp down, not securing cargo.
- Never stack tall loads without forward and lateral restraint. A tall stack secured only at the base can topple during turns or sudden stops.
- Never overtighten straps on compressible items. Crushing a couch arm with a ratchet strap or damaging a mattress with excessive tension defeats the purpose of protecting your load.
- Never leave straps with the handle open. An open ratchet can release under vibration. Always close and lock the handle.
- Never drive off without checking strap tension after the first mile. Cargo settles as you start moving. Stop a half-mile from the pickup location and check strap tension before continuing.
Wisconsin Load Securement Law
Wisconsin Statute § 348.10 requires that all loads be secured so that no part of the load falls onto the highway. If cargo falls from your trailer and damages another vehicle, you face potential criminal charges (misdemeanor) and civil liability for all damages. The law requires:
- Adequate securement to prevent movement and cargo loss
- Open trailers must have the load secured against movement in all directions
- Tarps or covers on loads that can blow or scatter (sand, gravel, mulch) when transported at highway speeds
When in doubt about whether your load is adequately secured, add another strap. There is no such thing as too many tie-downs for road transport.