I have a king cab so I ripped out the back seats and built a custom box to house my arb air compressor red arc solenoid optima battery all my recovery gear and my engle sits on top. Works really well. Check out my garage for pics.
Jim Allen swags is the best swag I have ever had camping in snow and rain is not a drama I hunt almost every weekend and the everyone in the crew use jim Allen swags put em up on a stretcher and you can't beat em http://www.jimallenandson.com all you will need is a good mattress
Cheers