I'd be surprised if solar panels in the roof were less than $2,000. An android-auto enabled head unit is like $500. Heated seats are often $1000 and that's "just" resistive wire. A cover for your truck bed is like $700. Premium carpet mats are $250. Unlocking your tailgate using a remote beeper instead of a physical key costs $300.

> IMO solar roofs are useful at the low end for ~400$

So I agree with this, but I don't believe that would be an option, at least without some DIY aspect.