SEN has those U shaped ramps for boarding WCHR's which we never had back in our day at LHR or LPL when I was at BMA - we had to lift on about 30-40 WCHR's - either by hand (carry ons) or the
Hi-lift truck for the lift ons- I seem to recall the fire brigade guys did the WCHR carry-ons for us...
Tarbes have air bridges - but can you put a jetty on a 146?