I'd be the first to suggest you not undertake a trailer project unless you actually enjoy that type of thing. I don't doubt that if I wasn't enjoying it as much as I have, it would still be an unpainted hulk.
I will second this statement 100%.
I haven't done a lot of fab work, but I have done some. Mostly cattle equipment repairs, trailer repairs, built my own roll cage for my Jeep as an addition to the factory setup and few other odds and ends. I THOUGHT I had a good idea of what I was doing and how to fit things together good enough to tackle a trailer project. In the beginning, figured I'd buy some steel, an axle, some lights and slap it together in a couple weekends then use it through the summer. I was WAY off on my early prediction. I have a build thread going somewhere here and you can see how far I've progressed. I have NEVER tackled a project of this size before, NEVER tackled this kind of steel fab work before and had NO idea what I was getting into. The statement above definitely holds true in that if I didn't enjoy this kind of thing, I'd be out a ton of time, a ton of money, and have nothing to show for it but a huge waste of parts, time and materials sitting in the garage taking up space. My goal now is to finish before winter. I'd LOVE to have it ready for elk camp at the end of October, but I really don't see that happening.
As for whether YOU need a trailer or not? Well, with your current rig, you being solo and camping, I'm kinda wondering why? If you're questioning it yourself, maybe try without for a while and see how it goes with your rig loaded up. What are you doing exactly? Wheeling? Camping alone? Combination of both? If just camping, I'd say forget the trailer, load up the rig and go. Being solo, you can get all your gear in your current rig and be fine. Prior to having our Baby, my wife and I fit most all our gear in our LJ. It was tight, but we did it. With the baby, we need the trailer. Now, if you're wheeling, I don't like all that extra weight and gear in the rig, so in that case, bring the trailer. Set up camp, drop the trailer and wheel. Spare parts, camp supplies, everything in the trailer ready to go. Food, supplies, tools, etc. all on hand if you need them. Build the trailer right and depending on the trailer, pull it behind you while you wheel. Keep in mind not all trails are trailer friendly though so know where you're going and your end location/destination and whether or not you need to drop the trailer when you get there.
Also, when looking at a trailer compare function of the trailer. I personally cannot afford a fancy AT Horizon, though I'd love to have one. It's a dedicated camping type trailer with basically one use. That's great and it's great at what it does, no question about that. I need something multi-purpose that can be used-and abused-doing many different things. I'm building mine similar in style to the AT, but heavier to meet my needs based off what I do and the demands I make off my trailers, and most importantly-multipurpose to meet the many requests I ask of it. If I had an AT and it was my only trailer, I wouldn't be throwing a ton of boulders or rocks into it to haul to the yard for building that rock wall in the front yard for landscaping the new house, or a ton of pellets for the wood stove, a bunch of firewood, yard debris, etc. Kind of limits the use of what you can do. I tried to address those restrictions with what I did with my build to get around that. To answer your question as to whether or not you NEED an off-road trailer, that may help sway your decision. Something along those lines that will serve dual-purpose, or multi-use may fit into your lifestyle better as you could use it off-road while wheeling and camping, then also around the house for utility work, ranch work, etc. That's exactly what I'm building and why I'm building it. Just a thought you may consider.
Sorry for rambling on so much.
Best of Luck in your decision,
Mike