If your having that much trouble at high tide,it most be high and dry at low tide.I had a similar problem on Lake Erie.There was a great location for a public launch ramp,very sheltered,but water level can be very low.It had three ramps and good parking,but only good for jet skis to launch.Someone dug out one of the ramps with a back hoe to allow bigger boats to launch,which helped a lot.I had a 19 foot fiberglass inboard on a roller trailer,I could launch OK,but had to walk the boat out about two hundred feet before I could lower the motor.Very nice sandy bottom though.To get back on point,I noticed that I had to repair my rear brakes more often when I had the boat and that was in fresh water.It would not hurt to check the rear end oil to make sure water did not get past the axle seals,as a precaution.As far as your truck is concerned,it will handle it no problem just dont get the exhaust to far under water and if it is,dont shut the engine off,because you may have trouble starting again.I mean if you check the 4X4 videos,some guys will go through water up to the hood with these trucks.I have not done it with my Trailblazer,but I had my Jeep Cherokee floating in a pond,the tires were not touching the ground and I still got out.One week later my wife asked what the noise was in the back of the truck,sounded like the ocean.Turned out to be 8 inches of water inside both rear fenders.:crackup: