Well, if you have to ask them I guess you probably know the answer. But the most important thing is what you do underneath. Are you going to just connect the bolts to the sheet metal floor, put big reinforcing washers, go through the frame, add a steel plate under the floor?
The sheet metal floor isn't much good for anything without some kind of reinforcement. If you search the site you will find lots of suggestions. Some might be overkill, some might make sense, some are outright dangerous.