Mine are almost identical to the OP. Two layers of treated 2x10 at 90 degrees to each other, spax bolted together. Small eyebolt on one side to pull with the awning hook.
Ole and Anne Anderson, Highland, Michigan
'02 Adventurer 32V, Ford F-53, ours since 4/08,Hankooks, Konis, SeeLevel, CHF
'84 CJ-7 , 5.3 Chevy, 3" lift, 33's, Detroit Locker, Fiberglas tub, winch, hi-lift