Is a Radial Tube Safe in a Radial Tire ?

Tooljunkie said

-- Think about it. There are tubes made for radial tires. Tire shop says no, we dont tube tires. Option? Well if you gotta roll, you buy a tire.
But my preference- no tube. Heavy truck/implement or off road. Yard beater. Sure.
Ever have to balance tire with a tube. Sometimes it doesent. --

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-- The reason that I'm interested is that I bought a spare (single) Centerline Auto Drag Wheel. I have 4 others. -- I bought it cheap, because it leaks between the 2 halves. -- I can seal it, but I thought that a tube might be an option. -- It's not a big deal, because, hopefully, I will never use it. -- As far as the Tire Shops are concerned, I would rather believe that They just don't want the possibility of a problem - Lawyers etc. They will install a tube in off-road tires, and trailer tires..