Great minds think alike. We have very similar setups, as long as we don't dwell on your one rather significant shortcoming...you have a Chrysler instead of a Toyota .Update on my pickup. Got tired of loading and unloading the camper between trips (it's 2" too tall to fit in parking garage at work). So I bought a cap/topper/shell whatever you want to call it used. Made a bed on one side with underbed storage for 2 containers one for my cooking gear and one for most of my bedding. On the other side I just layed up some plywood to make roughly three bins for storage of other items. Added a roof rack using 4 - 1.5" plastic blocks, 8 clamps, 16 - 1/4x2.5" bolts and 2 - 6'x3/4" pipe. It's wide enough for two kayaks or one boat. Gonna try this out this year for my overnight getaways. I think this will do ok for now. It is a bit taller than a regular cab hieght one which allows me to sit upright on the bed. Carpeted the floor so my son can come with me, just throw down a sleeping pad and bag he will be all good.
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As much as I drool when I see $100,000, now some are over $200,000, campers, I just can't imagine a better rig for traveling solo on back roads when fishing.