Poor load balance can have disastrous results

SAFETANK keeps the weight where it's supposed to be

Check out these links to better understand how load distribution works:

"80% of caravan rollover crashes we attend are due to bad weight distribution."
(Mike Clayton - Clayton's Towing)
"The most important factor in caravan stability is weight distribution."
(Colin Young - President of Caravan Council of Australia)

Collyn Rivers literally "wrote the book" about caravan dynamics
Towing Dynamics Demonstration on YouTube

Why would you remove a hundred kg from over the axles and then add a hundred kg towards the rear of a caravan?

It doesn't make sense.