Hello All, I am a novice builder who is currently in the middle of building a 60x60 barn (in -30 degree weather UGH). I am currently at the point where I have the floor trusses sitting on the first floor walls (2x6 stick built). The trusses are 24oc and they are 30 ft trusses (I have a double middle wall which holds the interior side of the trusses). The trusses are perfectly level if I place the level down the length of the truss. The issue is if I put the level perpendicular to the trusses I have a hot mess. I seem to go from high to low back to high across the trusses as I move the level down the 60 ft span. Is there an easy way to determine the high truss? Is there an easy way to get these level beside starting at the high truss and leveling all the trusses from there? I am fairly certain my high points are not on the ends. Any suggestions or tips would be greatly appreciated. The only odd thing I have going on is I put a triple top plate on. I am overbuilding due to lack of knowledge. I am fairly certain the cause of this leveling issue is coming from uneven concrete and has worked its way up to where I am now. Thanks!