EDIT: you tell me it's too small; that it'll be a bloodbath, and yet you want me to add a piece that would assure this? that's pretty hypocritical. Think before you speak.
Here's why we are saying to add a cross over...
The way your map is currently layed out, both teams can easily jump to the cart, and ride it to the end... this turns it into a "who can get the most people to fit on the cart" game.
-OR-
The way your map is currently layed out, both teams will rush to destroy each other, and you create a bloodbath, and no one pushes the cart.
There really won't be any middle ground.
Now, if you add the cross over and proper flanks, then teams can choose "Should we push the cart, or should we go and try to weaken the other team... before we are forced to meet up with them at the cross-over" This is good, because now the map isn't going to be one sided, bum rush the cart, or bum rush the other team.
... I'm not hypocritical, I'm just telling you what your map needs to make it better. You can go ahead an wait for the test, but afterwards, you'll be hearing these same things. And, I'm going to go out on a limb here and say, even though I'm not the best mapper in the world nor may Sruman be, but we know more about mapping than you. So let us help you, and listen and try out what we are saying.