Are you trying to make the truck visually level or physically level? If you make it visually level it wont physically be level. If you make it physically level it wont visually be level.
You're splitting hairs at a half inch of rake. Thats a full tank vs empty. Also, the front fenders set higher than the rear. If you try to level the truck based off wheel well opening, the truck will always have a forward rake.
Here is the review I found on Amazon that gave me the idea. He drilled out the rear hole instead of drilling a new one. https://www.amazon.com/gp/customer-reviews/REPFW5OTMBVUH/ref=cm_cr_getr_d_rvw_ttl?ie=UTF8
Yes, I drilled a new hole. But you can drill out the rear hole instead. But I wanted to have it as far back as possible. The front hole pushes it to far back causing interference with the plastic on the roll bar.
You can do it with one person. You would have to stage the boards accordingly and then place the top on the boards. That would be the hardest part. After that just pull on each strap little by little.