Been a tire man all my long life so I will stick my nose in here...
Like already said, a tire being Bias or Tubeless is not an "or" question; whether Bias or Radial, either can be tube-type or tubeless.
Myself, I would go for the 24.5 tubeless rims/tires if money and availability were the problem; however, I would AVOID any type radial of any size and much prefer a Bias tire, which is again going to be harder to find than a radial.
Regardless of what they cost at the tire store, radials are much cheaper/easier to produce which is why they have been crammed down consumers throats for the last several years.
If you are gong to drive a lot and use them up quickly, a radial may be okay.
However, if the truck is going to sit a lot and miles not accumulate very quickly, then Bias is definitely the way to go.
An old dry-rotted Bias fifty or more years old will stand out there in the sun and keep on soldiering on without flying apart.
A radial five or more years old, regardless of how deep the tread, will soon explode, sling it's tread, and wrap wire around the frame and axle, and can and will do this sitting unused out there in the driveway.
Contrary to popular belief, all those truck treads you see all over the highway are not retreads; they are the tread slung from radials; don't believe me ... stop and investigate them; you will see the rusty imprints of the steel cord on the inside of the tread strip.