I think only 8' campers might have risk of tipping forward when making front lower.
With my 12' camper I have to to make front lower than the rear at final loading point. I have wood guides behind the cabin and with empty truck leaning forward, it takes some level difference to have front of the camper go into guides before rear hits the deck.
The only risk of making front much higher is bending the jacks. They are flexible to some point, especially when you have dually brackets, but making 1 end much higher applies bending forces.