Freightliner Step Vans: MT45 vs. MT55 — What’s the Difference?
When it comes to expanding your delivery or service fleet, choosing the right step van can impact everything from fuel efficiency to driver performance and payload optimization. Two of the most commonly compared models are the Freightliner MT45 and Freightliner MT55. Whether you’re a FedEx Ground contractor or building out a mobile business, understanding the distinctions between these two chassis’ is key to making an informed purchase.
Let’s break it down.
1. Class & Chassis Type
MT45: Medium-Duty (Typically Class 5)
MT55: Heavy-Duty (Typically Class 6)
The MT45 is a great fit for regional delivery routes or mobile businesses that don’t need extreme payload capacity. The MT55, on the other hand, is built for heavier loads, larger bodies, and demanding route conditions.
2. Wheelbase & Length Options
MT45: Common lengths range from 14' to 22' cargo area, with wheelbases between 158” and 230”.
MT55: Typically 18' to 22' cargo length, with wheelbases between 190” and 230”.
The MT55 can accommodate longer bodies, more upfits, and customizations like dropdown stages, shelving, or bulk refrigeration zones.
3. Payload Capacity
MT45: Up to ~10,000 lbs
MT55: Up to ~19,000 lbs
If you’re hauling larger volumes or heavier freight, the MT55 offers nearly double the payload capacity, which is especially useful for contractors on high-volume routes or mobile units with heavy equipment onboard.
4. GVWR (Gross Vehicle Weight Rating)
MT45: 14,140 to 19,000 lbs
MT55: 20,000 to 30,000 lbs
The MT45 maxes out where the MT55 begins. That makes the MT55 a better fit for larger-scale operations, high-density deliveries, or heavier equipment installations.
Larger cargo volumes in the MT55 make it ideal for those who need to separate packages, install more interior components, or simply carry more.
Which One Is Right for You?
Choose the MT45 if you’re:
Operating light- to mid-weight delivery routes
Running a food truck or mobile unit with moderate interior equipment
Looking for lower acquisition and operating costs
Choose the MT55 if you’re:
Building a mobile retail, experiential, or outreach unit
Hauling heavy gear or equipment
Where to Buy MT45 and MT55 Step Vans
At Fleet Source, we offer a curated inventory of both Freightliner MT45 and MT55 step vans — many already reconditioned and ready for work.
✅ Nationwide Delivery
✅ Flexible Financing
✅ New & Refurbished Units
👉 Browse Our Inventory Now or Contact Our Team to find the perfect step van for your business.