3124. At least 24 feet with regular hitch and about 22 feet with swing hitch. Think about side of garage that you will store, walking room around TM in gargae and an garage service access or home entrance doors. And any step-ups in the garage such as where you enter home area. I have a 25 ft long 3 car side-by-side with one double and one single garage door. My 2007 2720 is actually 20' 3" when closed. The swing hitch takes it down to 18" 3". It will not fit through the single garage door. However, it fits nicely on the other side. I still have about 5 feet between the wall and back of TM which is where I have my 2 ft wide workbench.
For a 3124, I would suggest a garage that is at the least of 25 feet with no swing hitch. However, you will not have much room to maneuver at this length. So go as long as you can so you have room on all sides to manuever and add in sizes of anything that you plan to have next to the wall.
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