I ************ up when I bought this Chevy Z71 in the fall
can you sell the z71 and buy a full size, maybe a used truck? i wenk through the same damn thing. had a tacoma and went from camping under the cap then a gfc to get the extra room that i thought i could get by with, but eventually decided to sell and just get a full size (f150 crew cab w/6.5' bed) and an ovrlnd. you can surely get by with what you have but i was mad at myself to spend so much time and money to just be unhappy with my setup. the difference in room and comfort is ridiculous. I would still recommend the ovrlnd for sure and can answer any questions about that part of your setup. you may even be able to get by with just that if you build it out right and the weight of the ovrlnd being so light makes that a possibility (my fullsize w/front and back windows, dual side hatches and extra bedding height was right around 350 lbs. if you got a more spartan model, i bet it would be under 300. good luck with the setup.