Ok, here are some pictures of the existing joists. Nothing fancy, plain and simple. Since they are the old timbers, they measure the full 2" thick and 8" high. Not sure if you can see the crack that developed in the main supporting beam or not, but I have added a support post below this. Again, I don't know if the crack was always there, or if it just happened since we moved in, but I'm not taking any chances. I'm thinking it just happened.
Here is a picture of the garage attic where I have the tires and rims stored now. The tires that have rims in them, are back against the wall, as most of the plain tires are more out towards the middle of the floor.
As you can see from these pictures, the garage is quite full. After I blew the calf muscle out, I had friends and family help move the remaining items up from the old house, and as you can see, they just stuck stuff whereever they could. After I get this leg all healed up, I'm hoping to spend a couple of days reorganizing, and making room. When and if that day comes, we'll reflect back to these pictures to see how I did!