I use a 45* clear elbow. JMHO, but I think it provides less flow resistance, a better angle to most hook-ups, and it stores inside the bumper (male end first, once I remove it from the hose). I use a "shoe box" sized plastic tote for my 90* sewer-end connection, my donut, an extra hose/hose connector, and a couple of other sewer-related odds & ends. I keep a box of 100 disposable latex gloves and a can of sanitary wipes in the back door bin of my truck.
2013 Eagle 266RKS
2011 Ford F-150 w/3.5L Ecoboost & H.D. Tow Package