I'll take your questions one by one and do my best to answer them.
What is the difference in suspension and road manners between an SM and a TE?
According to Les at LTR, my SM610 was pretty much set up from the factory for someone weighing about 200lbs. It is my understanding that the TE isn't much different as far as stiffness goes. The suspension on an SM that's set up well for the street is going to be pretty harsh in the dirt. However the road manners of the SM will be much better. Also, if you plan on doing any canyon carving or semi-aggressive street riding, you'll be wishing you had the SM's monster front brake. It is really easy to outride a regular dirtbike brake on the street. That being said, I find that I can only go so fast in the dirt what with the limited clearance of my lowered SM610 combined with the streety suspension. Truth to tell, though, I have
no business hustling a +300lb bike through the trails anyway, so it's ok by me. I would rather be limited by suspension in the dirt than be limited by braking on the street, but that's just me
How is the SM as a dual purpose weapon, given my intended usage?
Sounds like you would be using your bike much in the same manner as I am. I am an oft-injured 45-year-old that cannot afford to take another hit. Yeah, I still ride the dirtbikes on regular trails, but I find I'm really enjoying the dualsport side of things lately...especially since I got my 610! I've ridden it on trails, across the desert, through creeks, through snow, up gnarly hills and, well, pretty much all over. I am extremely pleased with my decision to go with the SM. I bought it with the sole intention of using it as a long-distance dualsport adventure-ish type bike and it has not disappointed me at all. I didn't really plan on taking it on actual trails in the national forests, but it's such a capable bike that I was really curious as to how it would do. It did great! It'll kick my ass big-time if I try to make any serious time on it, but that's not what it's for.
What tires would be best?
My first off-road foray was on a set of Pirelli MT60's. They worked great for non-muddy dirt, wet rocks, creek crossings, not-too-deep sand and totally kicked ass on wet pavement. I found myself having trouble in mud and snow, though, so my next set of tires was going to have to be a bit more aggressive. I settled on a Metzeler Karoo Traveler for the rear (DOT knobby much like a Conti TKC-80) but was having a real problem finding anything agressive for the front. On a bike with as much power as the 610 puts down, I didn't want a wimpy tire on the front that was just going to get pushed around by the rear. I ultimately ended up going with a rear Pirelli MT-21 DOT knobby for the front in a 120/90-17 size. It was the closest I could find to the stock 120/70-17 size. It looks funny, and I thoroughly expected it to feel weird and not like it, but it works amazingly well! It provides me with forward motion in the nasty stuff and doesn't turn weird or anything. I fully expected my steering to be maddeningly slow, but it hardly feels any different than the Mt60's. It holds an edge better, though. The knobbies ride a bit..."lumpy"...on the street, and the front is a bit more slidey than the rear, but I only use them when I plan on being mostly in the dirt. They howl like the devil on pavement, too. The front seems to be wearing really well, but the rear is getting a bit funky...surprise, surprise
Can you put some bags on and carry gear for a long-weekend camping trip?
Yes. I use doggy panniers for bags, and they seem to be working great. I used to use a similar set for my plated KTM 450 EXC. I also have a rack made by ProMotoBillet. Motosportz makes a beautiful rack for the 610, but I went with the PMB rack because I needed pannier protectors, as I will eventually put bags on the rack. I've gone on a 1-night camping trip so far on the 610 and it held everything I needed. I carry a 1gal gas can on the rack when in remote places like Nevada and it works great. Another option for bags is the GiantLoop bag made by a really nice guy in Oregon. It bolts directly to the rear fender and side number plates and is a good option for the more aggressive dirt rider.
Here is my SM610 loaded for a 250-mile ride. Note the 5gal IMS tank...
Hope that answers your questions.
WoodsChick