radiators really aren't a big concern as long as its well protected. my number one for a bug out would be the ural patrol. followed by a triumph tiger or honda africa twin
though even the first gen venture is still a great option, ive run mine into the woods to go camping, through torrential rain, snow storms, ive even crashed one real good and its always gotten me home and run like a champ the whole way. good on gas and still fast enough to out pace most others who may want to chase.