Top Diesel Trucks for Fleets in 2025 — For Your Service Fleet

Are you ready to replace one or more diesel trucks in your fleet? If so, you should keep one thing in mind: not every vehicle will be the right fit for your purposes. For example, the Ford Pinto would be a less-than-ideal choice due to its:

• Availability. Since the Pinto was discontinued in 1980, it may be hard to find today.
• Design. Unlike most heavy-duty trucks, Pintos are subcompact cars.
• Engine. The Pinto never had a factory-installed diesel engine, making it a poor fit with diesel-powered fleets.
• Tendency to explode. This could interfere with your fleet’s ability to function as intended.

So, if not the Pinto, what vehicles should fleet managers invest in? 

We’re glad you asked, because in case you missed the title, this is our deep dive into the top diesel trucks for fleets in 2025. 

In this article, we’ll take a close look at the pros and cons of industry-leading light-duty and heavy-duty trucks. We’ll also list the most important features to look for in these vehicles and explain how you can effectively manage your updated fleet.

Key Features to Look for in Top Diesel Trucks

Doing your research is the first step toward finding the right truck for your fleet’s needs. When you’re in the market for new diesel trucks, prioritize vehicles that excel in terms of:

• Fuel economy and efficiency. For some reason, massive, powerful diesel trucks aren’t usually known for their fuel efficiency. Still, the more miles you can get to the gallon, the better.
• Durability and longevity. Replacing a vehicle is a significant expense for any fleet. Make sure you’re choosing trucks that are built to last.
• Payload and towing capacity. Even if you’re shopping for light-duty trucks, these vehicles need to be capable of delivering the performance you’d expect.
• Maintenance and repair costs. Though maintenance expenses are a fact of life for any vehicle, some trucks cost more to maintain than others.
• Technology and features. Trucks with cutting-edge technological advances and comfortable cabins will deliver a better driving experience than those without these perks.

Best Light-Duty Diesel Trucks for Fleets in 2025

Now that you know what you’re looking for in a new diesel truck, you’re ready to find trucks that deliver on these priorities. If you need light-duty trucks for your fleet, consider vehicles such as the:

2025 Chevrolet Silverado 1500

This light-duty Silverado offers quite a few engine options, including a Duramax diesel engine. It also excels in terms of maximum towing capacity, where it outcompetes trucks such as the Ram 1500. Despite its power level, the Silverado’s smooth, quiet diesel engine allows for a pleasant driving experience (and is more fuel-efficient than other Silverado 1500 powertrain options).

Since there isn’t a high-performance variant of the Silverado 1500, you’ll have to look elsewhere for a more powerful Silverado. Its interior isn’t as luxurious as the Ram 1500’s, either. Ultimately, this truck is an ideal pick for fleets in need of a light-duty all-rounder.

2025 GMC Sierra 1500

GMC and Chevrolet are both subsidiaries of General Motors, which explains why the GMC Sierra 1500 is so similar to the Chevrolet Silverado 1500. These trucks are nearly identical under the hood, and both are available with an optional Duramax diesel engine.

While this truck’s cabins tend to be more lavish than those found on the Silverado 1500, the Ram 1500 still beats both the Sierra and the Silverado in this category. Even so, this vehicle is perfect for fleets in need of a light-duty all-rounder without the word “Silver” in its name.

Best Heavy-Duty Diesel Trucks for Fleets in 2025

Light-duty trucks may play a vital role in your fleet, but they won’t be ideal in every situation. 2025’s top diesel trucks in the heavy-duty category include:

2025 Ford Super Duty (F-250/F-350/F-450)

Ford Super Duty trucks can be purchased with a high-output Power Stroke diesel engine, giving them the power they need to offer truly excellent towing and payload capacity. Meanwhile, upper trims (including the new Platinum Plus trim) can make this workhorse more comfortable than it is by default.

However, you’ll have to pay quite a bit extra to add diesel engines to your Super Duty fleet. Furthermore, the Ram HD outshines these vehicles when it comes to comfort and ride quality. With these pros and cons in mind, Ford Super Duty trucks are right for fleets looking for powerful trucks that can handle towing and hauling jobs with ease.

2025 Chevrolet Silverado 2500HD/3500HD

Fleets that invest in the 2025 Chevrolet Silverado HD will get impressive towing performance—especially when they opt for a Duramax diesel engine. These vehicles also offer adaptive cruise control and cameras designed with trailers in mind.

Unfortunately, the steering accuracy and feedback offered by the Silverado 2500HD and 3500HD isn’t as strong as you might expect. Their cabins also (and stop us if you’ve heard this one before) don’t quite meet the standard set by Ram. Ultimately, these trucks are ideal for fleets that need trucks with great towing capabilities and trailer-centric features.

2025 Ram 2500/3500

We’ve really been hyping up Ram’s interiors, huh? Well, there’s a good reason for that—these cabins are comfortable, modern, and nearly on par with luxury cars in terms of detailing. And when they’re paired with a high-output Cummins Turbo Diesel engine, the 2025 Ram 2500 and 3500 offer a ton of towing capacity.

Though diesel-powered Ram trucks get a few more miles per gallon than their gas-powered counterparts, these vehicles are far from any conventional definition of “fuel-efficient.” Even so, Ram’s heavy-duty models are fantastic for fleets that value both performance and comfort.

How Fullbay’s Software Helps Fleet Owners Manage Diesel Trucks

Congratulations—you’ve found and purchased the right diesel trucks for your fleet! At this point, there’s just one more question you’ll need to answer: now what?

If you try to manage your new trucks by hand, you could accidentally miss PMs, run into downtime, or waste fuel. Fleet managers can sidestep these issues by using Fullbay’s fleet maintenance management software to:

Track Maintenance and Reduce Downtime

Keeping track of preventive maintenance can be extremely difficult for anyone, especially when you have an entire fleet’s worth of service appointments to juggle. Luckily, fleet management software can automate these schedules and send you reminders whenever one of your trucks needs work.

Manage Work Orders and Repairs

Fleet management software can also help you generate and track work orders. When your system offers these capabilities and can guide your techs through inspection items, you’ll always be on top of your trucks’ service needs—preventing breakdowns and minimizing downtime.

Improve Fleet Efficiency with Real-Time Data

If your fleet management software can integrate with telematics, you can monitor your fleet’s fuel usage, driver behavior, and overall performance. That information will allow you to maximize efficiency across your fleet.

Make Way for Fullbay

By now, you know what features set the top diesel trucks (and the top fleet management systems) apart from the rest. With that in mind, you should look for products that deliver the features you need at an affordable price.

That setup would have been more effective if we hadn’t talked about the benefits of Fullbay in the last section. Still, Fullbay is the clear choice for fleet managers since it delivers powerful features like telematics data tracking, automated PM reminders, and work order creation. And that’s not all our software can do—it can also help your shop with inventory management, reporting, and customer communication.

Are you interested in adding Fullbay’s software to your shop’s workflow? Get started by scheduling a demo today!