Re: Pathfinder as tow vehicle
I tow with an '02 Xterra rated at 5,000 pounds (if memory serves me correctly - might be 5,400 actually) and I find it very capable towing my 3,000 pound rig. I wouldn't hesitate to tow more but I'm sure others will recommend that you not exceed 75% of the tow rating, or 3,750 pounds. Obviously Nissan is comfortable with the full 5,000 pounds and they're the folks who not only know the vehicle and it's capabilities best but also the people who provide the warranty coverage if it breaks. I'm sure their tow rating already has some margin of safety built into it. If the boat exceeds 1,500 pounds they recommend trailer brakes and this is required in most states - but I don't have them on my rig and I have no worries given it's performance without them.
Before you buy have a look at the Xterra. It's a bit more utilitarian than the Pathy but still a very sound performer both on and off road. In fact, it's probably better offroad than the Pathy is - not that this really matters to 98% of buyers. The upside is the price. The Pathy is definitely more plush but otherwise they're very similar and the Xterra can be had at a much lower cost.
Before you buy anything see if the dealers will let you take the truck and the boat for a day. The boat dealer may not like this arrangement but most auto dealerships who know you're a serious buyer will allow it. Tow the rig around with the truck and judge for yourself. There's no better way to make an informed decision than this.
If you have any other specific questions, please ask.