Have you got a welder? I began building a trailer with the notion of bolting it mostly, but wound up using both bolts and welds for strengths sake. I found a decent little 220V welder at Harbor Freight for about $60 I believe it was(on sale), but was only rated for up to 3/32 rods(if my memory is correct). I tried using 1/8(4/32) rods and about burned it up trying. I finally backed off to the recommended size rods, went slower to let it build up the puddles more(the effect I had hoped for with the bigger rods, but it wasn't strong enough to burn that hot), and began producing some decent welds with it