I'm walling in a front porch and removing the old exterior wall. That old exterior is one of two support points for the roof trusses. The new horizontal span is 14 feet. I want to add 2x6's or 2x8's as rafters beside and attached to the existing trusses to move the load to the new external wall and safely remove the old exterior wall. The roof pitch is 8/12. The new unsupported horizontal span is 14 feet. The existing trusses are 24 inches OC. I have room for a maximum 2x8 rafter size. Could I safely put double 2x6's beside each truss (24" OC) and provice adequate support for the roof? The bottom member of the existing trusses will remain as ceiling joists (and rafter ties).