If you are totally sold upon single slope you could use a monopitch truss with a raised heel on the low side to keep from having the one wall so tall or you could use a parallel chord truss set at an angle.
Single slope roof pole barn.
I will be building a single slope roof and 3 sides covered with corrugated steel pole barn similar to one of your designs online.
Single slope metal buildings are made with non combustible materials and provide reliability strength and excellent corrosion protection all of which are ideal for longevity.
A single slope shed is the simplest kind of pole barn design but it can serve a wide variety of functions.
The structure consists of 3 20 x 10 bays.
Lean to shed kits are a popular choice for diy builders looking for something cost effective and easy to erect.
High side to be 12 feet and low side to be 10 feet with bay entry at high side.
Roof slope should be no less than 3 12 to maintain steel warrantees.
Single slope metal buildings or structures are ideal for a variety of space needs such as storage classic carport loafing shed pole barn or other types of shelters.
From a loafing shed for animals to a lean to garage for your car to a commercial building and even a multilevel home a single slope pole barn can be just about anything you need.
If you have a roof slope of less than 3 12 the warranty on the paint of the roof steel will be void.
Single slope roof pole buildings are not only economical but offer a unique design that allows for architectural details that cannot be used in typical pole building design.
Some single slope roof considerations.
My ideal design is 20 by 30 with 1 foot roof overhang.