I would have thought after the Pressure Update that things like tires would have buoyancy because tires are filled with pressurized air...

Please? Like really pretty please? Tires offer a lot of buoyancy. Even small tires offer good amounts of buoyancy. There's already a buoyancy part for helicopters. Why isn't that in the tires?

In fact, take it one step further and allow the player to connect tires up to fluid. We can then regulate the pressure within the tire on the fly. Every semi-truck in the world has this capability for example.

Power pass through so dually (or triple or however many the player wants) tires are a thing. Dually tires have little space between them. So that block sticking out needs to go away.

Allow the player to make the tire wider. We can edit the radius. Why can't we edit the width? Again, semi-trucks often run something called "Super Singles". Instead of a dually. It's a really wide single. Something like 400-450mm.

The only grip factor I use is High Grip at 100% because nothing else wants to work. Even this is like being on ice. Please allow the player to set as much grip as we want. Even unrealistic grip like sticking to the ground and stalling the engine. Silly? Yes, but let us do it so we, the player, having something to work with.

Continuation of grip factor mentioned above. In the game, the more mass you add. The more tires slip. That...is not how rubber works. Not one bit. Please readdress this mechanic. Rubber has unique properties. The primary driver of determining grip with rubber is it's contact patch via surface area. Down to the molecular level. More mass pushes more of the rubber flatter and into the ground. I.E. Bigger contact patch. If anything, more mass means more grip. It also means harder to stop but that is a separate matter.

There are tires where, when big enough, have the capability to store things. Like tools or fuel.

All of these things should be fully editable by the player. Not via XML but within the game.