Currently Ross has around a 50% attrition rate, judge your studying capabilities.
Can you take 3 courses of power points and carve the exact word-for word descriptions into your brain on your own? If so then yes you can handle Ross.
It is a lot of work, and less hand holding.
You're going to be frustrated with the amount of work you put in on a daily basis, it is going to be a ton of work. I still remember staring at the beaches at night hoping to get home. But in the end it is all worth it. You will appreciate the opportunity you have.
Ross, SGU, AUC are all esteemed Caribbean schools. Some programs may turn a blind eye to you when applying for residency but do well on your boards, study hard, impress your attending physicians during clinicals, and you will be fine. If you want to stay in the states consider retaking your MCATs and doing post bacc's and getting an MD degree. You do not want to ever be at the disadvantage of being called a DO. It is very hard to be recognized by actual boards for your research and many patients will feel less comfortable.
During residency, my fellow DO friend and I were both asked by our attending to give a surgical consult. I went in the morning, everything was fine, my buddy went in a few hours later, once the patient found out he was a DO, the patient said "lets wait for what the expert has to say". I will never forget that day.