How to lower a semi-trailer box by getting rid off the axles?

My husband and I bought a salvage semi-truck (18-wheeler) trailer (box) to use it as storage in our property. We want to get rid off the axles and lower the trailer almost to ground level to make it easy to step inside it. Is a 45 footer trailer box. Our terrain is sand. It only has the back axle and the legs that come down for support in the other side. Thanks for your ideas. We had thought of setting tower made with cinder blocks and then taking the axel off and then taking one by one of the blocks until it almost comes to ground, leaving some blocks between the ground and the trailer and then building a ramp to access it even to put inside our little tractor and the land mower but I am still weary if this is the best options. Thank you for your help.