The DUKW. 4-wheel drive 2.5 ton amphibious truck...
Besides cool factor, I dont know what it could do that the LVT cant..besides drive faster.
And on the topic of easy addons for a future patch...How about the cannon packages for the Ju-88, and the cannonpod and gunpod options for the Ju-87.
And as someone else mentioned, a 109T...Only thing that kept them from being used as carrier born fighters was a carrier, which we have. So why not?