If your looking to haul things larger than your 450i then a larger trailer might be needed but for the 450i the 6x10 might do the job. On my machine I found I needed at least a 60" inside width and a 10' length to load the machine with difficulty. Those are quite nice looking trailers but so is the price...same old story you get what you pay for!! Boy a 16' long trailer with tandem axles....you plan on buying another 450i?? LOL