Product Description
Introducing the 7K-KIT212 Triple Axle MD (Medium Duty) Trailer Kit – the perfect balance between braking power and cost efficiency. This customizable kit includes three 7,000 lb axles, one electric brake axle, and two idlers, paired with your choice of 17.5” solid black single wheels and tire combos, and one of three slipper spring options to fit your trailer’s exact suspension needs.
This “MD” medium-duty configuration is ideal for trailer builds that need braking on just one axle while still supporting triple-axle load capacities. Perfect for gooseneck trailers, landscape haulers, tiny homes, and more.
Included in Kit:
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(1) 7,000 lb Electric Brake Axle(8 Lug, Fast lube, EZ Lube, Pre-Wired, 9/16” studs, powder coated, auto adjusting brakes)
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(2) 7,000 lb Idler Axles(8 Lug, Fast lube, EZ Lube, Pre-Installed Hubs, Pre-Wired, 9/16” studs, powder coated)
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(6) Springs of your choice (choose above)
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(3) U-Bolt Kits
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(1) Triple Axle Hanger Kit (Slipper Spring Style)
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(6) 17.5” Tires on Solid Black Steel Wheels – choose your preferred tire size and ply rating
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All mounting hardware and components required for installation
Spring Options (Select One):
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TPU-232: 5-Leaf, 27" Long x 2" Wide Slipper Spring
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TPU-161: 6-Leaf, 29-1/2" Long x 2" Wide Slipper Spring
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72-51: 7-Leaf, 26-5/8" Long x 2" Wide Slipper Spring with heavy duty rubber bushing
Tire & Wheel Options (Select One):
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215/75R17.5 16-Ply Tire on Solid Black Single Steel Wheel (rated at 4,805 lbs per tire)
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235/75R17.5 18-Ply Tire on Solid Black Single Steel Wheel (rated at 6,005 lbs per tire)
Why Choose the MD Kit?
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One brake axle provides essential braking power at a lower cost than HD kits
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Customize your spring rate and ride quality
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Choose the tire load range and look that matches your build
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Complete kit with everything you need to install the 7k triple trailer axle kit
What Does "MD" Mean?
“MD” stands for Medium Duty. Our naming system is designed to help you quickly identify the right kit configuration:
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LD = Light Duty (All Idler Axles)
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MD = Medium Duty (Mix of Brake and Idler Axles)
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HD = Heavy Duty (All Brake Axles)
More advanced variants like BI (Brake-Idler-Idler) or IIB (Idler-Idler-Brake) may be added for clarity.
Let us know what configuration you're building, and we’ll match the best kit to your needs.
