If i read the situation correctly, Angiolino. You cant find a source in your part of the world. Again knowing where that is would be helpful. Never know we might just have your local distributor as a member.
One would think that 25-35mm bar for the axle, with matching bearings for wheels, a 50mm heavy wall handle 2m long, possibly tapered (weld in a piece that fits inside) so the handle end is closer to 35-40mm to fit your hands better. You cam make multi steps if your hands are small. Handle length is dependent on your weight. Im over 1.8m and 90kg. If your'e 1.5m and 50kg your going to need a smaller diameter (at your end) longer handle. Don't set the foot angle to steep as you need to be able to comfortably reach the end of handle to apply your weight. A short cross bar is also helpful some times.
A 100mm foot, a 2m handle and a 150kg operator equals 3000kg. As your only lifting one end at a time, and your foot isn't going to be that long, or you so light, you should be good.