Yes; 59" wide for your trailer frame is very wide. Extremely wide.
Check out this post and the next one:
http://www.jeepforum.com/forum/f27/...d-up-thread-1180456/index29.html#post14977300 It'll help you determine your needed axle width (Hub Face-to-HF).
Like you, I've got a TJ on 33" tires with aftermarket rims (about 4.25" backspacing) - don't know if you're running stock or aftermarket rims. To run this same tire/rim combo I've got on even a 40" wide trailer (what I've got) I would need an axle hubface-to-hubface of 55 - 56". To run this same tire/wheel combo on a 59" wide trailer I would need an axle 74 - 75" wide. And that's just the axle HF-to-HF width; it doesn't include how much the tires stick out from there.
If anything, you want your trailer's track width slightly narrower than your tow vehicle's track width. Especially if you'll be taking it off road. From the link above you could take your current wheels and tires (if that's what you plan on using for your trailer) and do the reverse math and figure out how wide a trailer box you could go and have the trailer's tracking width match your Jeep's tracking width.
Check out these pictures of my Jeep and trailer (before I put the diamond plate tub on the frame). These are with a 51.25" wide HF-to-HF axle and 205/75/15" tires. It'll give you a little perspective on trailer tracking width vs. tow vehicle tracking width. I'm much less likely to hit stuff like trees and rocks off-road with the trailer's tracking width being a little narrower than the Jeep's.
http://www.jeepforum.com/forum/f27/...d-up-thread-1180456/index26.html#post14711818
