What % of income for monthly payment consider okay

I hear ya gator, I learned the hard way also. I bought my first RV by borrowing from my 401-K at 7%. I was bragging to my friend how savy I was to only be paying 7% interest. Then he pointed out to me had I left my money in my 401-K, I would have gotten 22% return that year on that money (it was only a short term loan for a cheap RV). I quickly learned that even if I had gotten a loan at twice the rate 14%, and left my money in my 401-K I would have come out ahead.