problen qith new flat bed trailer

[jack van]

so i just finished building my first flat bed trailer 1st problem lol me lol it seems it pulls to the driver side in reverse and when it goes forward and i am sure it is not the driver well almost sure hehe . now before i fire myself i thought i would check here i think it might be the axles could be out a bit but i would like to know if there is a way to check out the alinement and sorry about the spelling i checked to see if axles are in straight but they are moved over to driver side by about an 1/8 of an inch to the driver side of rig but they appear to be straight.the trailer will move to driver side of rig about a 1/4 inch in the length of the trailer