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I got an 40/20/40 with lumber support in my Ford F-250 Supercab 4x4. It still is not 100 percent comfortable as I would like it to be with the way the 4x4 drives. I am going to replace them with air seats. An family member is an truck driver and he had air seats installed in his Ford F-250 to help with his back problems. It had been very effective for him on long trips.
Here is the website of that company he got the seats from... www.industrialseats.com
They sell all kinds of air seats from tractors to rigs with the light duty trucks (f-250 to F-550). Check it out. It would be worth checking with your back problems.