Klymit Double V not supportive enough

I recently went camping over Labor day weekend and found that while the Klymit V with a couple folded blankets on top is supportive enough for me, it doesn't work well for my wife. I've seen a few suggestions about how to add more support - like a latex mattress topper or tri fold mattress. Wondering if anyone has any experience or suggestions to try on our next weeklong camping trip.

I do have a 2" latex full mattress topper that we keep at home but it seems a bit bulky to fit in our car. Not that another 2" topper or something similar would take up less room necessarily but just looking for options! Also wondering if a 1" dense foam topper on top of the Klymit would be enough support.. Thanks ahead of time for any suggestions!