Any ideas to improve my load while keeping it light ?
What are you kidding!?!? As you approach the speed of light, your mass will approach infinity. This means you will require a likewise infinite amount of energy just to move. On the other hand, time will also slow down for you, relative to everyone else moving at a slower speed. So you'll have plenty of time to figure out how to do any of this.
If you go faster than the speed of light, then you'll go back in time and rethink the wisdom of this light speed trip.
Da Bing