What am I missing? I ordered a standard tall fifth-wheel awning hardware/arms to go with my new awning. Upon installation it became very clear that there seems to be one short and one tall? I don't understand why they don't need to be the same length...the awning track is level and we are normally level with our Rv. It wasn't even obvious when we put them up but as soon as we finished and went to unroll/set we learned this. The real question then is this: If this is supposed to be this way then which end would the shorter one be on? (extra good to know why as well). Thanks!