I have a Paros 4 place dual axle open trailer with 10" tires that I'm totally tired of trying to keep running, and was wondering how the best way to convert it would be. It currently has straight axles with springs over. I was wondering if a 4" drop axle would set the trailer too high for a 13" wheel? Would I be better off to use another straight axle and block it down? This second option has me adding alot of length to the shackles and such. Also, anyone have any inexpensive suggestions for online purchase of the axles and tires/wheels? Thanks for any info guys.