rear fill in a truck

[ddumb8 10+ year member]

I have a 2000 Nissan Frontier X-cab truck with a Kenwood KDC-X589 head, a Kicker Kx 650.4 amp pushing 2 CDT-EF61 comps and a 12" Kicker CompCVR in a sealed box. It sounds decent but I need some rear fill. The problem I have is it is a truck and I don't have anywhere to mount any coaxials, any suggestions?

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[Towncar 10+ year member]

Im not understanding why you need rear fill? A good set of comps should be plenty for you.