Hi Rich
I towed a 3124ks last year with with a 2004 4runner.
The below site has alot of good info on RV towing.
http://www.rvtowingtips.com/
A 3124 ks is 24' when it is closed up for towing. According to the data you should more wheel base for this length of trailer.
Now the data does not take into account a lighter, collapsible trailer.
I could not afford to buy the trailer and upgrade my TV so I made the decision to take a chance with the 4runner.
I personally had no problems but stayed out of the mountains and did not have any emergency situations. Due to inattention one time I did go onto the shoulder one time and whipped it back onto the road and had no problems. Luck could have been a factor.
No problems with trucks passing me at high speed on the interstate. Valley WDH with no sway bar.
I traded in the TM for a 24' Sunline full size TT. Just moved hitch over to new trailer. Very dangerous! Definitely showed the impact of having a large box sitting up in the wind.
Wind would blow me all over the place. I immediately upgraded to a Equalizer brand hitch designed for sway control. Improved towing experience 80% over Valley hitch.
What is funny is the magazines always show jeeps or pathfinders towing even larger TTs with no problems. No way would I go larger with my current setup on flat land.
There is no way I would attempt to use my current setup in the mountains. I am stuck at the moment for flat land trips. I mostly do weekend camping so this is not a big deal at the moment. I will upgrade TV in a couple of years when the 4runner is paid off. If I had not upgraded the trailer I was going to get a class b to tow the TM.
One of the most dangerous situations is to be descending a mountain and having to complete sharp turns in the process. A trailer will want to go straight and could easily overpower the TV. Situational awareness is a must any time you tow.
Bigger TV is always better, at a cost. A 2720sl would be better but hard to give up the king bed.
Look hard at your long range plans for camping. If you think you will upgrade to a larger TT in a year or two then maybe it would be worth getting a better TV now.
I thought about trading in the 4runner for the new Tundra with the 5.7 V8. It would definitely be ok for my setup since it has a 10000# rating. I am holding out at the moment for them to work the new platform bugs out and I am hoping they will do a diesel in a year or two.
When do you pick up the trailer?
mike