My folks started renting trailers during World War II. They added two Ford N series tractors to their home rental business after the war.

Once I got old enough to be trusted with such transactions I was on the phone letting men know that, yes, “They are full-sized tractors and we have the implements you need to get your job done.” If they needed more than one implement (perhaps a plow to turn soil, a disk to break it up, and a blade to level it off) we had a heavy-duty flat bed trailer that tilted and had a winch for loading the tools. They could pull the loaded trailer to their job site with the tractor.

We rented the tractors, including implements, by the gallons of gas they burnt. “That way if you get called away from the job you are not paying for the use of the tractor.” We always gave the example that perhaps they’d have to take a phone call. And yes, kids, we had to go in the house to use the land-line phones in those Barbaric times.
The rate for our tractors was $5 for the first gallon of gas, $4 for the second gallon and $3 for every gallon thereafter. Gas was going for 20¢ a gallon at the time so this was when questions really started to fly!

I had heard the answers from my dad many times and repeated them: “How much gas the tractor burns depends on what you are doing. Plowing is a lot harder work than leveling. The tractor will burn more than a gallon an hour when plowing, depending on how hard the dirt is. You get over an hour per gallon when disking. And yes, you drive the tractor to your work site. The tractors have an overdrive for highway use and they get around 16 miles per gallon.” Our customers considered that good gas milage back in the 1950s, when cars were built like tanks and had big, inefficient V8 engines.
Usually the customer would show up as soon as he could get to us. But sometimes the man on the other end of phone let us know he could rent a garden tractor for $1.25 an hour. We’d mention we were renting full-sized Ford tractors and, of course, we certainly respected his knowing what was right for his project.
Sometimes a man would show up the next day saying he had tried a garden tractor and had barely begun his project when it got dark. Two to four hours later he’d swing our Ford tractor back into our driveway, pay somewhere between five and ten dollars, and let us know he’d be telling his friends about using a “real tractor.”