If you need the whole car "up in the air" and only have two jackstands, use a floor/shop jack to raise the car and put a set of ramps under the other end of the car's tires first. I also use this idea when only needing one end of the car up but I remove the ramp off of the platform as I don't really like jackstands. This gives the needed room to move around without having to lay across the ramp. If your's aren't removeable, turn them around the other way.

DON'T FORGET TO CHOCK YOUR OTHER WHEELS BOTH IN FRONT AND BEHIND to keep the car from rolling.

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)