Have to agree with smallfry here, trying to fit engine covers to a G550 on a windy, snowy winter day on tarmac in Aspen, precariously perched on a 12ft ladder rig (tallest on the airfield) is not an experience I particularly care to repeat.
If Gulfstream/RollsRoyce want us to cover the engines on short stops, they're gonna have to provide us with a much smarter and safer cover/attachments system... I didn't go to the effort of flying safely for 20 years just to break my neck falling down a ladder