The seats in the VX are not the best, that's true. But, why oh why are you taking a VX on a 4000 mile road trip? That's punishment in itself. Road noise will be a constant companion and the ride will be harsh if the roads are rough. Please tell me you have an aftermarket cruise control unit installed. If you don't, there's your whole problem in a nutshell.
I'd say your best bet is to place a small pillow - like a throw pillow used on a sofa on the seat behind your lower back. Even with cruise control on my VX, a little extra lower back support helps me tolerate the ride better.
I just completed an 1100 mile roundtrip with my 92 VX three weeks ago (average 47 mpg, AC on all the time, 70- 75 mph). Fortunately, the roads in Tennesee, Kentucky, and Ohio were pretty decent. I wish I could say the same about my adopted home state of Michigan. The roads I drive every day are really bad. I'm amazed my VX hasn't fallen apart like the Bluesmobile did outside the Daley Center (yet) after 5 years and 107,000 miles.
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