When possible, I always upgrade to LT ("light truck"), or "load rated" tires. Too many SUVs come with "passenger car" tires, with softer side-walls and 40# pressure limits. A "load rated" tire with an "E" rating will have a ten-ply side-wall *equivalence*, and be rated for 80 psi, not 40. Yes, I know it's confusing. It's a ply-equivalence based rating, rather than the actual ply count. (no, I have no idea what that's all about!)
notes on tire load ratings:
http://www.google.com/search?client=saf ... 8&oe=UTF-8
All those SUVs (mostly Fords) that were rolling over a few years ago? It was because they had passenger car tires, rather than "load rated" light-truck tires on-board. Load rated tires have always been recommended for taller and heavier vehicles. Trailer sway places similar loads on a tire sidewall.
BTW, the Equalizer Hitch folks do recommend their device for boat trailers with surge brakes.
http://www.equalizerhitch.com/productin ... bility.php
"Boat Trailers:
The Original Equal-i-zer® Sway Control Hitch can help you achieve worry free towing for your boating adventures. In the past boat owners have been limited by their inability to use weight distribution with their surge style trailer brakes. Equal-i-zer®'s unique sway brackets are compatible with most surge style trailer brakes.
Until now Sway Control has also escaped the boat towers grasp. Traditional add on sway products limit or distort the amount of front to back movement and render surge style trailer brakes useless or even dangerous. The Original Equal-i-zer® Sway Control Hitch allows most boat owners with surge style brakes the opportunity to have the benefit and comfort of 4-Point Sway Control™."