Potential new 2003 convert, help!!!
 

So, ya, it's been a while! I used have a 2001 v6 I drove around for a long while, now I just found what I woul like to be the perfect v8 convert! It's a car from Florida, now here with me in kingston Ontario.... So y'all yanks might appreciate that :p
Took a tester today, and a few things im reeeeally worried about is that there might be some water in the back that swishes around.... Can I get that out and how?
Also, he said he had it sitting for while, so when I first took it out I thought the alignment was facked! After a highway pull, it stopped shaking like it had parkinsons, and smoothed out..... Normal? Maybe a quick explanation please?
Thanks in advance!
And if there's any real worries you think I should take a better look at, shout out before I make a mistake!

Also, it seemed at speeds thé hood shook quite a bit. Is this also normal?

so what developed out of this car, I think I would have walked away from it unless a mechanic could explain to me what it was prior to purchase