It looks like all you can do is wait for the arrival of the RAV. Theres really not much more you can do. Unless you decide to pull out of the contract... Hopefully things go well and you get it by the end of the month (at the latest) :)
Insurance wise your not suppose to have anything wider then 7 inch... I have seen the following sizes on the Gen 5 (without mods). 18 X 7.5 (Kappa) 18 X 8 19 X 7.5 19 X 8 (these were rubbing when turning corners)
If you have windscreen insurance cover then you dont really have to worry about it... If it needs to be replaced then have it replaced. The Insurance will pay...