My guess would be the trailer. The trailer takes a lot of getting used to. Because it is 2 different pieces of equipment.... You have to think differently. A straight truck would be like a large car. The trailer is a big deal.
Kearsey is correct, in my opinion. I’ve driven both straight truck and pickup + trailer regularly during my construction career. Have always had trailers. The one I had to be the most cautious with was a double axle Gator trailer used to transport my skid steer. It took a 1 ton truck to pull that load and it still made me nervous. Straight box trucks with no trailer, no problem.
I have a slightly different perspective on this…trailers do require more skill, agreed and require more time to learn backing and turning.
However the two are different, especially when driving a class 7-8 straight truck like a mixer or dump truck. All of the weight is on top of you, concentrated in a smaller space. And it tends to be top heavy.
I drive both a tri-axle rated at 73,000lbs and a tractor trailer, on road and off-road. Overall I prefer the tractor trailer. It handles better and stops quicker, less tendency to roll.
Either way, take time to learn your machine and respect the physics of weight, speed, distance, terrain and turns.
take time to learn your machine and respect the physics of weight, speed, distance, terrain and turns.
G-Town makes a great point. When I had some trucks we were often on job sites that were under construction. A dump truck or cement mixer can really be dangerous on uneven terrain. They are top heavy and can really be challenging in the environments where they are often called for.
We had the same issues with our crane trucks. They were top heavy because of the telescopic boom. I had straight trucks turn over more than once when I was in that business.
Combination vehicles certainly provide more of a challenge with maneuvering, but a dump truck can often carry as much weight as a semi yet has less brakes on it. Stopping a dump truck or concrete mixer can get expensive with all that new underwear you need to buy.
A vehicle with two separate parts - the power unit (tractor) and the trailer. Tractor-trailers are considered combination vehicles.
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