You guys kill me. I have both a M105A2 and a M416 (small). I pull the M105A2 out of my pasture with my FJ40, fully loaded with firewood. I wouldn't take it out on the highway unless it was behind my Dodge Ram, though. The M416 is a small trailer and is perfect behind an FJ40, but not wide enough for my bigger ATVs to fit inside. Either will hold more weight than you probably want.
I'm going to build racks for my Dodge and M105 for fetching firewood. Calculations show 6' deep in my Dodge and 5' deep in the M105 = 4 cords total. There's places I can get that much wood in a day, but it's a long drive, so I'm planning for an overnighter.
To the OP, I believe the M105 would be fine behind either of your tow rigs if it was lightly loaded (i.e. just camping gear), however the issue you'll have right off the bat is the height of the lunette and actual height of the trailer with the stock tires on it. I'd pass and wait for a M416 or M101 to show up.
Weights of these trailers:
M104 = 2,400 lbs empty, 7,900 lbs gross
M104A1 = 2,730 lbs empty, 7,230 lbs gross
M105A1 = 2,650 lbs empty, 7,150 lbs gross
M101 = 1,340 lbs empty, 3, 590 lbs gross
The M104 can be loaded up to just shy of 4 tons, and it weighs almost 1-1/4 tons empty. It's sheer size makes it a poor choice for most trail rigs, unless you consider a Duece and a half to be a trail rig.
The M101 (US) weighs just under 3/4 ton empty, and can maxes out at 1-3/4 tons or so. This is more than ample for most people needing a trailer. Indeed, the M101 can carry a half ton of cargo before it weighs the same as an M104 trailer.
The M105 is simply too large and impractical for most people, especially those without large pickups. That's why these trailers are typically half or even a quarter of the price of an M101. They just aren't in demand.
Oh, and another thing. Some states have a weight cutoff point for title and registration. In Oregon, if you keep the gross weight under 1800 lbs, you don't need to title or register the trailer. While this only gives the M101 a quarter ton payload, people can fudge this and get away with it. Happens all the time. The M105 on the other hand exceeds this weigh limit empty, and is large enough to attract the attention of the cops.