It's possible on the G550.
We brought a 14 foot telescopic ladder, it collapses down to virtually nothing.
Then we have two types of engine covers, Jetbrella for over night, these can be installed and removed with the ladder.
The standard material type for longer periods are normally fitted by the handlers using the baggage loader.
On the old G3 and G4 we had a 'Condom' made to cover the complete forward section of the aircraft for the long term parking in the sand box. Didn't do the windows much good though!