Built tough, the Velocity flatbed and drop deck trailers feature 4" I-beams on 12" centers, one piece welded knee braces, and legendary Fontaine XtremeBeam™ mainbeams. Constructed with continuous welds on both sides of the upper and lower flange using Grade 130K load bearing material, the design is so strong that we back the mainbeams with the Fontaine Trailer XtremeBeam™ Limited Lifetime Warranty*.