when straping down my xj i strapped throught the "C" on the frt axle in a criss-cross. on the rear axle i criis-crossed over the springs.
i use 10,000 lbs strapps w/ axle straps, this is the way all the car guys i know transport thier car and rigs and they have been doing it this way for years. i have been doing it this way for about 5 yrs and have had no issues. in fact i was pulled over by a DOT police officerand he said i was the only truck and trailer he had pulled over in a while that "used proper binders, in the correct manner" made me happy
i was told if you strap the body down the suspension will "load and unload: creating a "unsafe condition"
just my .02