Launching with wet tires

Looking at the picture in your first post, Mike, I wouldn't change the drop or rise of the ball mount. Your trailer frame looks to be quite level - which helps your brakes work properly and equalize the distribution of weight between the two axles.

How far into the water are the tires going? If it's only far enough to get the rubber wet, absolutely don't worry about - it's totally fine.

FYI... with bunk slicks or rollers... to keep the boat from sliding off before you're ready... just put the engine in forward gear and give it some gas.
 
Toyota rear suspension is generally soft; especially with the TRD Off Road models as they’re supposed to articulate better off road. The first picture looks okay but I think a riser would help and your trailering wouldn’t be too affected. I have a 208 and used a 2” riser with my 2015 Tundra even before trailer modification.

If you have a fabrication shop nearby you can look into adding a sliding/extending tongue to your trailer; your truck tires will never get wet. The bracket up top is for the surge brake actuator. The surge brakes are bypassed when the tongue is extended as the lower pin is used. Total extension is 7.5 feet.

Another option would be to replace/extend the trailer tongue a couple feet if your brake lines and light cables are long enough.
 

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