I have to agree to a certain point. I had the same dream....though very short lived. hahahahaahahah Many of those horses in the feedlots are there for a reason. Either medical or behavioral. Some of them are quite dangerous and would need the best of the best as far as training to make them ridable... some will never be ridable. Broke horses with lots of life left in them can't be given away where I live. The horse market is way down so, it's time to get realistic.
#1 your venture is not going to be profitable.. so forget about the truck that needs fixin
One vet bill can wreck everything. These horses come with no history and come being exposed to everything under the sun. Add that they are stressed which makes them more susceptible.
#2 even if it's not profitable, you can still do some good if you have a place to keep the horses that is safe and cheap/free. The cost of feed/bedding/vet/farrier needs to be all considered. Even if the horse goes barefoot, it will still need a trim. No one takes excellent care of their horse just prior to handing it over to a KB so, it will probably need its teeth floated and vaccinations, etc.
Try and pick a horse that's worth saving. We'd love to save them all.. but, that's not realistic. But, if we save one that's already trained, young enough to have lots of life in him/her and is personable and not crazy, you have a real good chance of placing that horse so you can save again.
Good Luck. I HAD 2 "saves" from the feedlot. One is my trusty steed, a 10 year old appendix QH whom is such a gentleman, I am so thankful I found him every day. He is my boy! I found out he had sold for 3500 just 6 months before and was the result of a back board situation. The other was my nightmare. After trainers, a saddle fitter whom also tested for back pain, teeth floating, shoeing, 6 months worth of feed/hay and several near tragic accidents, we faced the reality that this horse was going to hurt someone. I gave her away with full disclosure to a gal who specialized in drafts (she was a perch cross) and I hope that all is well but, I have my doubts. I lost her number in my latest cell phone episode so I have no way of knowing... which is probably best. I probably should have "manned up" and had her euthanized but, I didn't have the man parts for it. She was "led thru" the auction and that was my first mistake...
Good Luck and ALWAYS stay safe