Maybe we will make war wagons in deployed position. But for now it is not necessary. You must know that in this scale 1 stand represents about 50 men. In case of tabor, one stand is probably 20-30 wagons arranged in 2 lines. So even if deployed the whole tabor won't be "shorter" than in movement.
Sometimes tabor was a real fortress - wagons were chained together, and filled with earth. But AFAIK this was done only in case of long sieges. Normally wagons were arranged in this way that back wheel of one wagon was chained with front wheel of the other. Unfortunately we know this from text and it is hard to find good reconstruction of tabor. Maybe it looked like this:
[WW]H - imagine this is war wagon and horses from above.
--- is just an empty space
X is a chain which chains together back and front wheels of wagons
Tabor could look like this:
This is of course just one "wall" of tabor. As You can see always back of one wagon is chained with front of the other. This forms a kind of train. The horses inside are covered by wagons so the enemy can kill only those outside, but to do this he must be in shooting distance of whole tabor. If enemy will kill all outside horses he will kill only half of the total number of horses in this train so it could be possible to move. Or maybe those wagons from outside didn't have horses, and those inside have spare? In this manner all horses would be covered and tabor could still move. And of course if horses are killed there is still much of Cossack rabble inside so they could be send to push the train