Most problems with hovercraft based vehicles are due to the fact that there is no friction between the hovercraft and the surface it is transversing.

Poor acceleration and deceleration makes sprinting between cover difficult, although you can stop quickly if you "dump the bubble" and slam it down on it's belly (probably not recommended practice).

Hover tanks only work well on flat surfaces (level ground, swamps, etc.).  Irregular terrain, like a boulder field, abatus, or tank traps, will dump the bubble and immobilize a hover tank.  A trench may also be effective the same way.  And where a tank can just push though some terrain (small tree's and brush) a hovercraft needs to back up and accelerate to build momentum and ram.

 

On a slope you have to rely on thrust and momentum.  Stopping is not an option, getting moving again is extremely difficult, and lifting after you have set down is worse.  Traversing across a slope requires a hover tank to "crab" it's way, with the bow pointed up the slope, and it's side armor in the direction of travel.

The only solution is to increase the thrust to weight ration to in excess of 1 to 1 (and probably greater than 1.2 to 1).  What you will have then is a flying platform than normally operates in ground effect.  Might be a good replacement for the helicopter instead of the tank.