I can’t seem to find a load calculation chart for a w6x15 steel I beam at a 20’ span. The load would be distributed ( tractor, atv, utv, etc). Beam will be supported on both ends. Specs are as follows: area-4.43, d-5.99, bf-5.99, tf-.26, tw-.23, lxx-29.1, lyy-9.32 Thanks