Glad to hear about the extra sway bar. Be careful how much you crank down on it. All you want to do is snug it down good. Play with it a little and you will find the right torque. Too tight and you can easily break either the little ball on the hitch or break the connector on the sway bar. If you do go to E tires, don't expect much out of them if you only run 45 to 65 lbs. Air them up. You may want to check into the stable loads, they will engage the overload springs and aren't terribly expensive. You have what you have, improve what you can within reason, slow down and do the best you can. I pulled many miles with a less than ideal setup, and am still alive. Enjoy your rig and set a goal; you'll get there!