Walmart sells a small grease gun that uses little 4 or 5" long grease tubes. It is the perfect size to stick in behind the tire and hit that grease fitting. It is also small enough to keep in the vehicle, if you want. The downside is your choices of grease are limited, so if you use some high-tech super grease, you can't use it. They do have lithium marine grease for it I think.
Rescu2000
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2003 Liberty Sport 4X4
DIY Frankie Lift, BBS Rims, Aussie Locker Rear, DTT Front, Renegade Rack & Light Bar, Custom Front Bumper w/ Warn XD9000i, Custom Rear Bumper, JBA UCA's, Full Skids(Mopar, Kilby and Super skid), CRS Rock Rails, CB, EVIC, Nav, power dim mirror, (2) 8" subs under front seats.
http://www.cardomain.com/ride/2512777