You have limited space to store stuff and when you going offroad you need to make sure everything is secure. Here are some great options to help you get secure and organized.. but you better have some deep pockets or high limit on credit card cause they aren't cheap

Air Down Gear Up (ADGU)

I love this system and I like it becauses it doesn't use thick wood panels for the drawer system. So not adding a lot of weight but you can clearly see its high quality. When I price it out for my 4Runner its as low as $4000 and easily up to near $8000.

Interior Dimensions of drawers: 33" L x 15.25" W x 9" H (this allows for storage of 7.5" tall items in the drawers)

Solid Wood Worx

A more affordable solution that may work. Looks like quality and less than half the cost of ADGU at $2400.

DFG Offroad

This is even more affordable and appears to be a solid product from reading. It sells for around $1500

WheelsFeels.com

Seems as an affordable but well built solution coming in around $1300 with free shipping in the United States