RAM 2500 & 3500 Towing Capacity in Australia: Factory Ratings, Hitch Setup & Towing Guide

Factory towing capacities: braked vs unbraked, payload and maximum ball weight

Most Australian-delivered RAM 2500 conversions carry a braked towing capacity around 4,500 kg, and some RAM 3500 conversions are rated higher. Exact figures depend on the converter, model year, axle ratio and hitch fitted, so always check the compliance plate and the converter's documentation for your specific truck rather than a brochure or forum post.

In Queensland, trailers over 750 kg need brakes, and trailers over 2,000 kg need brakes that operate on all wheels, can be applied from the driver's seat and include a breakaway system. That means an electric brake controller in the truck for almost every serious caravan or horse float setup.

50mm vs 70mm tow balls and pintle hooks for caravans and horse floats

The standard Australian 50mm tow ball is generally rated up to 3,500 kg. Above that, trailers typically need a 70mm ball or an alternative coupling rated for the load — and every part of the chain (receiver, tongue, ball, coupling and safety chains) must be rated at or above the trailer's mass. The lowest-rated component sets your limit.

• 50mm ball — standard for caravans and trailers up to 3,500 kg; check the stamped rating on the ball itself.
• 70mm ball — used for heavier trailers where the coupling is designed for it; the tongue and receiver must match.
• Pintle hook and ring — common on heavy plant and machinery trailers; very robust but noisier and less refined for caravans.
• Off-road couplings — articulating hitches for touring vans; check their rated capacity and ball download limit.
• Weight distribution hitches — can help level the combination, but must be approved by the vehicle and hitch manufacturer.

Many RAM conversions arrive with a US-style 2.5" or 3" receiver. Make sure the tongue and ball you use are rated for that receiver and marked for Australian use, and that the tow bar itself is certified for the capacity you're towing.

Weight distribution hitches vs airbag helper suspension for level towing

Heavy ball weight pushes the rear of the truck down and lifts the front, which lightens steering and front braking. There are two common ways to level the combination, and they do different jobs.

Many RAM 2500 and 3500 owners use both: airbags to hold ride height day to day, and a WDH on the heaviest vans if the manufacturer allows it. Neither raises your GVM, GCM or towing capacity — they just make the rated capacity safer to use. Pair either option with heavy-duty suspension and wheel alignments so the truck sits and steers correctly with the van on.

Essential towing maintenance: transmission, differentials and brakes

Towing 3 tonnes or more up the Blackall Range or the Toowoomba range puts serious heat and load through the driveline. That's why specialised RAM servicing with a towing-focused inspection matters more than a basic oil change.

Transmission temperature management

• Use tow/haul mode and watch transmission temperature on long climbs.
• Service transmission fluid and filters on the severe-duty schedule if you tow regularly.
• Check transmission and engine coolers for bent fins, blockages and leaks.
• Treat shudder, flare or harsh shifts early — heat-damaged fluid is the usual cause.

Differential fluid servicing

• Towing heats diff oil fast — change front and rear diff fluid on the severe-duty interval.
• Use the correct grade and friction modifier where the axle requires it.
• Check for pinion and axle seal leaks, especially after beach or water crossings.

Brake wear

• Inspect pads, rotors and brake fluid before every big trip.
• Replace brake fluid on schedule — old fluid boils sooner on long descents.
• Calibrate the electric brake controller so the van does its share of the braking.
• Use engine/exhaust braking on descents to save the service brakes.

Pre-trip towing checklist for RAM 2500 and 3500 owners

1. 1Weigh the full combination and compare against GCM, GVM and axle ratings.
2. 2Check hitch hardware ratings and safety chain condition.
3. 3Test brake controller output and breakaway system.
4. 4Inspect tyres (truck and van) for load rating, pressure and wear.
5. 5Service transmission fluid if you're near or past the severe-duty interval.
6. 6Check cooling system hoses, coolant condition and fan operation.