The floor jack I have is a 2-ton, weighs 15-20 pounds in the box. The jackstands are in a similar-sized box and weigh about 15 pounds. I can get the car safely in the air in about 20 seconds. And, I have a 12" dvc sub mounted in a vented enclosure with a 400 watt amp...

Sometimes you may have to get the car elevated a little with a flat to get a floor jack under something good to lift on.

Pretty well totally collapsing sissor jack may be the best overall bet. One with a extension rod combined with the crank handle. Should be very cheap to find a good used older one. That should also meet your total needs on the road.

Stan Marsh "Jacking-it in San Diego" Music Video - YouTube