2018 Ram ProMaster Towing Capacity & Payload Guide

The 2018 Ram ProMaster can tow up to 5,100 pounds when properly equipped. Unlike traditional rear-wheel-drive body-on-frame cargo vans, the Ram ProMaster features a front-wheel-drive unibody platform, which prioritizes massive interior cargo space and impressive payload capacity over extreme towing numbers. If you need to haul heavy tools inside the van while towing a moderate trailer, the ProMaster is highly capable.

Quick answer

• Max Towing Capacity: 5,100 lbs (across all models)
• Max Payload Capacity: Up to 4,680 lbs (varies by wheelbase, roof height, and model)
• GVWR (Gross Vehicle Weight Rating): 8,550 lbs to 9,350 lbs
• GCWR (Gross Combined Weight Rating): 11,500 lbs
• Curb Weight: 4,500 lbs to 5,100 lbs (approximate)
• Hitch Class: Class IV (available from factory)

Note: Always verify your specific vehicle’s ratings by checking the door-jamb sticker, as added options reduce payload and towing capacities.

Tow ratings by engine & trim

For 2018, the Ram ProMaster cargo van is exclusively powered by the 3.6L Pentastar V6 engine paired with a 6-speed automatic transmission and front-wheel drive (FWD). Because the powertrain and platform remain consistent, the maximum towing capacity is capped at 5,100 lbs across the board in accordance with SAE J2807 standards. The payload, however, varies significantly based on the van's classification (1500, 2500, or 3500), wheelbase, and roof height.

Tow package contents

To get the most out of your 2018 Ram ProMaster’s towing capabilities, you should look for models equipped with the factory Trailer Tow Group. This package ensures the vehicle is wired and reinforced for hauling.

The factory tow package typically includes:

• Class IV Receiver Hitch: Bolted directly to the unibody structure.
• 4-Pin and 7-Pin Wiring Harness: Integrated into the vehicle’s electrical system for trailer lights and brakes.
• Trailer Sway Damping: Integrated into the ProMaster’s Electronic Stability Control (ESC) system to automatically apply individual brakes if trailer sway is detected.
• Heavy-Duty Engine Cooling: Standard with the 3.6L V6 to manage the heat generated during towing.

Note: An integrated trailer brake controller was not a standard factory option for the 2018 ProMaster, so you will need to install an aftermarket brake controller if your trailer is equipped with electric brakes.

5th-wheel & gooseneck

Because the Ram ProMaster is a unibody, front-wheel-drive cargo van, it is not compatible with 5th-wheel or gooseneck hitches. These types of hitches are strictly reserved for heavy-duty, rear-wheel-drive pickup trucks or chassis cabs with traditional ladder frames. All towing with the ProMaster must be done via a conventional bumper-pull receiver hitch.

Weight distribution & WDH requirements

Since the 2018 ProMaster uses a front-wheel-drive architecture, maintaining proper weight distribution is absolutely critical. Too much tongue weight on the rear hitch can lift the front tires, significantly reducing steering control and traction.

• Tongue Weight: Keep trailer tongue weight between 10% and 15% of the total loaded trailer weight. Do not exceed a 510 lb tongue weight limit.
• Weight Distribution Hitch (WDH): Ram recommends using a weight-distribution hitch for trailers weighing over 3,500 lbs. A WDH will help transfer weight back to the front axle, ensuring the drive wheels maintain traction.

Real-world towing tips for this vehicle

1. Mind the FWD setup on boat ramps: Front-wheel drive is great in the snow, but pulling a heavy boat up a steep, wet ramp can cause the front wheels to slip due to weight transferring to the rear.
2. Watch your GCWR: The ProMaster has massive payload capacities. If you max out the cargo van's payload with heavy racks, tools, and materials (say, 4,000 lbs of gear), you will likely exceed the 11,500 lb GCWR if you also try to tow a 5,100 lb trailer. You must balance internal payload with trailer weight.
3. Use extended mirrors: The ProMaster is exceptionally wide. If you are towing an enclosed utility trailer, consider upgrading to extended tow mirrors for better rearward visibility.

Common towing-related issues

• Front tire wear: Heavy towing without a weight distribution hitch can cause erratic steering and premature wear on the front tires due to reduced traction and suspension geometry changes.
• Transmission heat: While the 62TE 6-speed automatic is reliable, towing at max capacity in hilly terrain can generate excessive heat. Fluid changes every 30,000 to 50,000 miles are recommended for heavy towers.
• Aftermarket wiring gremlins: Because the ProMaster uses a complex CAN-bus electrical system, splicing into the taillights for a DIY trailer harness can cause lighting faults. Always use a proper T-connector harness or the factory 7-pin setup.

Towing beyond your vehicle's limits puts you and others in danger while accelerating wear on your drivetrain. If you need a transmission fluid flush, a brake controller installed, or a suspension inspection before your next big hauling job, find a trusted shop on Repairius.