Deputy Eddie Noel, the Assistant Treasury Minister, said it was found to be technically feasible to extend the car park but the additional cost would be difficultto justify.
Other proposals in the party's discussion paper, New Priorities in Difficult Times, include selling off a city centre car park in Belfast's High Street to raise funds.
Dewi Davies, the national park's senior warden in northern Snowdonia, said disposing of their bodies was proving to be difficult because of the remote location.