[GTP Dad]

Welcome to AF!!

As for the hydroplaning issue it is possible that the tires are in fact not channeling the water properly even though the tread is in good shape. I would have the alignment checked and replace the front tires with a better tire if it continues. As for the problem in the rear, check to make sure the sway bar is properly connected and not bent or damaged. Also check the struts as they may be worn causing you to get the noise. The whirring noise possibly could be a bad wheel bearing that making a noise.

As for the leaking trunk. Check the rubber seal and the body seals in the trunk. One way to do this is to have someone get in the trunk with a flashlight and close the lid. Spray it with water from a garden hose to see where the leak is coming from. It can usually be fixed with silicone sealant.