Hi Neu. I am not a fan of packing heavy objects at the rear of the trailer to offset hitch weight. Instead just consider getting them over or slightly behind the axle. Packing heavy items at the very rear of the trailer can introduce a pendulum effect which can cause a sway situation.
Check your manual to see if Audi has a maximum height on how much the ball can be above the mount. I know some manufacturers do including tesla.
Even swapping out the lead acid 12 volt for a lithium battery can help the situation.
Is your Audi a Plug in hybrid or full electric?
Happy camping Neu.
