hopefully it is a manual as the 300 tdi autos are crap for towing as the box overheats so take care if the light comes on and give it a rest for 10 mins before carrying on. extra fans and intercoolers on the auto box seems to have little effect. I know your boat is quite large and heavy so take care if tis the auto one.
i had a 200 manual, 300 auto and now td5 auto for the past few years
200 was rough but faster and economical, sloppy on the road
300 was sluggish, overheated the box slightly less sloppy on the road
td5 best of bunch and auto box superb but not as fast as would like, handles nicest
all my landys have sold for more than i paid for them which keeps me happy
ps does your bass speaker in the door rattle the back of the car if you play some thumping music?
have harmon kardon system in mine and kicks out some thump and rattle