Vikings were know to be a bit nose heavy and at Autair empty Vikings were taxied and flown with 300Kg ballast bags at the back of the rear hold. There was a Baggage trolley permanently based on the ramp with the ballast bags.
of course in @pre Computer@!! days it did sometimes happen that aircraft arrived with a full load plus ballast !!!
One of the Vikings was sold to a Southend operator whose crew came to pick up the empty aircraft. We asked if they he would ensure that the ballast was returned to Luton. Not wanting the hassle they said take it off now which we did. We later got a phone call saying guess what happened in Southend !!
Yep on the nosed up !!