Hi all,
Just joined the site. I purchased a 22ft 4,300 lb travel trailer about two months ago. I tow with an 02 explorer with the 4.6 v8, I have had no problems pulling up down the biggest hills in PA. on rt 78 and keeping at 65 but this is at the price of mpg. I can average as low as 8.8 and as high as 11 depending on headwind and hills. My set up is 10 ft high and 8 ft wide. There is no way I would even think of doing this without a good hitch set up and break controller, I use the Equal-i-zer hitch with 1000 lb weight distributing bars and the prodigy break controller that is mounted to the right of the steering column by my right knee, no problem with any knee interference and I am 6 feet. I did quite a bit of research and the set up seems to work fine for me.
I am, however, at the limit of my length vs. my wheel base. The common figure I have seen suggests that you should have at least 110 inches of wheel base for the first 20 feet and then another 4 inches of wheel base for each additional foot of trailer...this figure eases as wheel bases get beyond 130 inches, so, if you use that figure you may be a bit undersized with regard to wheel base.
When I replace my tires I will get LT tires to stiffen the ride a bit and may think about some helper springs. Hope this was some help to you.
PS. If anyone knows where to get some good mirrors for trailering with the explorer please feel free to shout out, I use the CIPA strap on mirrors and they suck in so many ways I do not even want to start.