Do you really need a hangar? Ramp tiedowns at AVL are $12 per night plus a $29 handling fee, which is waived with 7 gallons of fuel purchased. Self-serve qualifies at $5.13. Security and facility fees still apply, but I think they're only $5 or $10. They have large communal hangars, but I don't know what Signature charges for those. You could call them and ask. (828) 687-7110. Signature has a rental car desk right in the lobby. I have a hangar there but doubt that two planes will fit.
(2019 dues paid)