Will one suitcase weighing 50 pounds and another weighing 20 pounds will be ok.

Azad Karimi got it right. You are allowed two pieces of luggage; a large one and a small one. The next one will cost you $15.

I travel last week with a very heavy suitcase and a small one and a carry on they dont weight them

I don't think or have never seen them wieght them, for ten years I have never seen the under bus storage full, but give them a call.

Lucky Star Bus allows each passenger to bring (1) small carry-on bag not weighing more than 10 pounds and (1) standard luggage bag not weighing more than 50 pounds.