a few things. As others have mentioned a short wheelbase can be problematic with a longer trailer as you can easily get tail wagging the dog type feelings. Couple that with a trailer pushing the limits of the tow vehicle and it quickly gets scary. How do I know? I've been there with an Armada and a 30' TT. The armada had a tow rating of 9100 lbs but only had an available payload of 800 lbs. my TT weighs 7000 lbs loaded and has a tongue weight of close to 1000 lbs. I used everything I knew from 20 yrs of towing horse trailers to keep it under control. The engine struggled going up mountains and we struggled coming down mountains.
I taught my husband how to drive the TT with that rig. He knew it felt uncomfortable and difficult to keep straight on the road but has admitted as a towing newbie he would never have known that wasn't right. After not having enough truck to control the TT coming down a mountain in VA we upgraded to an F250 diesel. Towing is fun again. DH couldn't believe the difference having the right tow vehicle for the job made. I'm not saying run out and buy a diesel. What I would do is look at TT and see what size and weight you really want and then buy the tow vehicle that can really handle it with lots of room to spare. The extra room to spare gives you TT upgrade room as most only keep their 1st TT for a year or two before trading on something bigger or heavier. When buying the tow vehicle remember a longer wheel base is better.
As for the hitch there is no such thing as integrated wdh into the tow vehicle. Some have built in sway control but you should really gave an antisway device on top of that. The wdh is a platform style hitch head that plugs into your tow vehicles receiver. It transfers some of the tongue weight off the rear axle forward onto the front axle and back onto the trailer. This helps level the TV out preventing an oversteer or an under steer condition when adjusted properly. WDH can be purchased as just wdh or as a wdh with integrated sway control. Sway control can be a friction sway bar or integrated sway control (like Reese dual cam or equal-i-zer). Typically friction sway bars are only recommended for trailers up to 26' over that you really should have integrated sway control. Check your hitch ratings to see at what tongue weight wdh is required. Also check your manual as some smaller tow vehicles do not recommend wdh... I believe the range rover has a wdh recommendation for over a certain tongue weight though. Another thing, make sure your tow vehicle has a towing package with a transmission cooler. You want a good brake controller also. ideally you want either an integrated brake controller or a proportional brake controller (like prodigy p2 or p3) not a time based brake controller.
here are some pics of different types of sway control for you.'
wdh w/integrated sway control pics
Reese dual cam
equalizer
friction sway bars
Here is some reading to help you out....
wdh on etrailerhow stuff worksrv.net how wdh worksrv.net how to set up wdh
