YOU COULD LOOK INTO GETTING A BUNGEE. YOU CAN SET UP BUNGEES IN PLACES THAT YOU COULDNT PUT A DROP IN, BUT IT ALSO WORKS THE OTHER WAY AROUND.
ALSO KEEP IN MIND THAT YOU SHOULD HAVE AT LEAST 2 PEOPLE WITHOUT SKIS ON PULLING IT BACK, THEY'RE CRAZY HARD TO PULL BACK AND YOU NEVER GET AS MUCH SPEED AS YOU THINK YOU WILL