When I'm doing some serious travelling and camping etc. I throw a full size spare wheel, my tent, fishing gear, sleeping bags etc up there.volleybiggs said:
Easy enough to get up there using a "quick step".. handy unit that folds flat and stores in the back. http://www.bushranger.com.au/quickstep.php
I know you can get them in the states...just google "wheel step" or something along those lines.