I've been shopping for my first airplane over the past couple of months. I can't realistically afford anything beyond the J and K models so that's where my focus has been. The Js were spec'd at just under 1100lbs useful load and the Ks were spec'd right at 1100lbs. I fully understand that some minor fluctuations are going to occur from aircraft to aircraft. I recently saw a K model for sale that listed only 830lbs as the useful load. What do some folks do to their airplanes that bring the load down that much?? If I buy an airplane like this, can most of these "mods" be reversed??