The JD Water Roller is the ideal piece of equipment to ready your arena for wet weather, or to tighten loose footing. 
In all arenas, or pasture maintenance, you need to control the air pockets for wet to dry versatility.  By adding the roller (water filled to achieve proper weight desired) to your maintenance program, you can tighten up the surface (compress the air out) which will allow more water to run-off of the arena surface during wet weather. 
By controlling water run-off, you will have less  percolation - so it will dry faster, hence, you can use the arena sooner (less down time).
The roller can be pulled by a tractor alone, or with adequate HP, in tandem with a harrow.