That's why I didn't do the freelancer even though I own my own business. I just got a letter from my doctor I've been seeing in Bangkok and she wrote me a letter stating I'm a patient of hers and the hospital on official hospital letterhead. Was approved with no questions aaked.
I applied through Washington DC, I didn't have to show a plane ticket but they did ask for a flight number. I only showed 1 month of bank statement. I rent a condo, so that was the address I used.