Naio,
Does the vehicle have "tow hooks" at the front? If so, a ratchet strap to the sides of the rack would keep it from flopping from side to side.
Mine had dual receivers. Make sure there is enough clearance for air for cooling the engine.
I did just one 600 mile trip with the front rack/cage. It was in June and the engine ran hotter than without the rack.
My overhang without the rack on the rear is 11.5 feet. The spring folks didn't like that one little bit.
The way to decide whether it is ok on the rear is to calculate the wheel base to length ratio. 55% or higher is ideal. 50% is on the edge and you will be doing a lot more "driving". Below 50% is, so I'm told, NOT a good idea. A 26 foot RV is 55% with 176 inch wheel base.
My RV is 28'5" and works out to 53%. My previous unit was 26 feet. Tail swing is WAY more on my current Rv, and I had four tail swing "encounters".
I've finally learned how to avoid such issues.
