Not sure what effect they'd have with towing not having them, but everything will still go on ok, without. When I pulled my hitch, I just left them attached. Not sure why they'd leave them on the vehicle. On my ZJ, the hitch was similar but without having any braces on it. Should be no problem putting them on afterwards, or fab'ing up your own. There really isn't much to them. Picture a tubular piece that's pinched at the ends with holes to bolt into the hitch at one end, the rear of the jeep at the other.
The beatings will continue until attitudes improve!
HID Quad bi-xenon + foglight retrofit