I have a 24+' tandem trailer for my 24' JC Tritoon. It currently is equiped with 20x10x8.5 little fat tires that do not seem to handle any trip much more than 75-100 miles. I am thinking about changing shackles, brackets etc to accomodate larger tires. Has anyone ever done this or have any comments? Other than the small tires this trailer was manufactured by JC Pontoons for this boat and is super heavyduty.