If all else fails ......
Memory Caveat!! ..... If the memory module is working correctly ..... During the annual Aldershot Army show in the 80's, they used to land a Hercules on the grass arena, loaded with a missile system and troops, landing strip distance was 100 yards. After unloading at the double, Herc then took off with no problems - so the islands would be a doddle - maybe a bit noisy?