I have that same crummy light which works intermittent at best. The trouble seems to be the light socket itself which doesn't hold the bulb correctly.
I was thinking about soldering some wires to the light socket contacts and running a long strip of LED's down both sides of the doorway or use a couple of LED puck lights.
What do you think?
Steve, Christy, Anna and Phoebe (Border Collie)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley Arrow hitch with adjustable stinger
WBCCI # 3072