If rolls of paper you might look at a straddle with a long arm as an option. Combilift also has the CSS (Contrainer loader and un-loader slip sheet), if the skids in the container are suitable this might work. All depends on the container size and volume of loads and cost justification. They also have the CB series that can fit into the container. The design team can spec a truck for you. Always goo to have options.

i believe it can be done. but be careful when container is overload. better doing it carefully, to making sure the safe.

I did some quick Google searching & found if the container has wooden floors the max load forklift axle load is 5460KG. Type in ISO Container Floor Loading Limits - you get a lot of info to review.
Don't have time to do more searching but you can do the same. A site you may want to go to is -
www dot hapag-lloyd dot com / downloads /

4300mm three stage mast,

I am just worried about the weight of the Fork when handling load inside container, front axle load is about 7000kg. will this weight effect the container floor ?

1. In the US I have run into some 20" containers that are not in full spec (ISO) compliance to door way height. I ran into this on 20" container with marble slabs coming from India. This should be confirmed.
2. Typical manual dock plates with have a break over point going up & is usually positioned closed to the container or trailer doorway, this cause the overall height of the forklift to increase as it goes up an incline into the container or trailer, the thickness of the dock plate reduces the clear height.. The amount of increase will be dependent on the relationship between the container or trailer bed to the dock height.
Self leveling dock plates the break over angle adjusts to the variance in the difference in dock & container or trailer height. Manual plates it is a fix angle.
3. Not clear as to meaning of "4300mm mast, may be 4 or 5 heigh" I understand a mast that can lift 4.3 meters (4300mm).

1) 20' and 40' standard cargo container. Fork has free lift mast. 3500kg @500mm
2) self levelling i think. what would be the difference ? please ex plane.
3) 4300mm mast, may be 4 or 5 heigh
4) 1000mm approx
5) double stack

One would need to know more information.
1.) What size container 20' 40', etc. and the "clear" door opening height? - reduce the clear height by the thickness of the dock plate
2. Is the dock plate manual type or self leveling? If manual dock plate how much break over is there in the plate?
3. How high do you plan to stack the paper rolls after unloading?
4. What is maximum height of the paper roll?
5. Will they be single or double stacked inside the container?