Oxygen concentrator needed

Due to dialysis, I now have respiratory/heart problems. I am on continuous oxygen and I'm limited to where I can go and how long I can stay. I feel as if I have a lot of living left and would like to be able to visit my family and friends without having to have 5 heavy portable tanks in tow. I have a concentrator at home, but there's no way I can travel with it. Also, the long tubing on the stationary concentrator presents a tripping hazard. As of right now, Medicare will not pay for or rent the Inogen machine because I've exhausted my funds for oxygen therapy. Every little bit helps and is greatly appreciated. God bless.