MZS Adjustable Trailer Hitch for 3" Receiver — 8" Adjustable Drop/Rise, 21,000 lb GTW, Aluminium with Locking Key

The MZS Adjustable Trailer Hitch is a heavy-duty, CNC-machined aluminum drop/rise hitch that fits 3"×3" receiver hitches and offers up to 21,000 lbs GTW with an 8-inch adjustable range.

Designed for extreme towing needs, this MZS hitch combines a precision-machined aluminum body with chrome-plated steel tow balls and a patented quick-adjust mechanism. It’s intended for trucks with a 3" receiver (found on select heavy-duty models) and gives you a simple, secure way to change ball mount height in one-inch steps. The unit includes two ball sizes and a lockable adjustment key for on-the-road peace of mind.

How does the adjustment system work and how fast is it?

The patented adjustment lets you raise or lower the ball mount up to 8 inches, in one-inch increments, using an integrated keyed mechanism. Turning the key releases, repositions, and locks the mount—no loose pins or tools required.

• 8-inch rise and 8-inch drop capability, adjustable in 1” steps
• Locking key for rapid, secure repositioning
• Tool-free height changes compared with traditional pin-and-hole systems

What towing capacity and couplers does this MZS hitch support?

This ball mount assembly is rated to tow up to 21,000 pounds Gross Trailer Weight (GTW), suitable for heavy trailers and commercial loads when matched with a compatible vehicle and wiring. It includes two ball diameters so you can work with a variety of trailer coupler types.

• 21,000 lb maximum GTW rating
• Comes with 2" and 2-5/16" chrome-plated tow balls
• Compatible with common heavy-duty trailer couplers when properly installed

What materials and finish protect against corrosion and wear?

MZS builds the main body from high-strength aluminum, CNC-machined for consistent tolerances and weight savings. The tow balls are chrome-plated steel for impact resistance and corrosion protection, and the assembly is engineered to resist cracking or flaking in tough conditions.

• CNC-machined aluminum body for durability and reduced weight
• Chrome-plated steel balls for corrosion resistance and longevity
• Precision manufacturing minimizes play between hitch and receiver

How do I know this hitch fits my truck and receiver?

This adjustable hitch is made exclusively for 3"×3" receiver openings, which are less common and generally used on heavy-duty trucks. Confirm your receiver dimensions before ordering; some model years and trims may differ, so measure the receiver opening to ensure compatibility.

• Designed for 3.0" square receivers only—measure before purchase
• Often found on heavy-duty truck models and select post‑2017 units
• Installation requires matching vehicle rating and proper hitch pin or locking hardware

Who is this for: The MZS Adjustable Trailer Hitch is aimed at drivers who tow heavy loads and need quick, dependable height adjustments—commercial haulers, agricultural equipment users, and owners of heavy-duty trucks with a 3" receiver. If you require a high-capacity, corrosion-resistant ball mount with fast, tool-free height changes and dual ball sizes, this hitch provides a practical, durable solution when matched to the correct receiver and tow ratings.