Yes, you can get a BBJ into ASE. There is a 100,000lbs limit single truck(wheel). The ramp is stressed for 150k. The approach is not to bad even in WX.
I had seen a DC-9 in there a couple of times. I left ASE prior to the BBJ coming out in force, so I did not see one up there. You will pay a lot to have it sitting up there or they may ask you to park it in RIL, GJT, DEN.
If your friend has a BBJ that he wants to take into ASE, PM I will be more than happy to show him the ropes of getting in and out safely. I spent 4 years living and flying out of ASE.