personally, on a vehicle that has not got the more modern rubber hanger mounts, I like to use this style of hanger which simply uses a cheap clamp to attach to the pipe. on the frame end of things i usually use a short length of flat bar as a washer to keep the fastener from working through the rubber. the rubber on these is like a tire or conveyor belt material with lots of fiber strands to keep it flexible but not easily stretched out and broken.
https://www.summitracing.com/parts/aph-8462
this style is another of my favorite styles as it has a captured rod laid in the rubber bed that is firmly attached to the frame end, then the rod can be bent and welded onto the pipe as needed or a bracket can be welded on where needed to firmly blot it to the muffler or pipe. it can also be bent into a shape to accept one of those rubber donuts that you see on more mosern vehicle exhaust hangers
https://www.ecsexhaust.com.au/exhaus...ber-mount-10mm
like these
https://www.canadiantire.ca/en/pdp/n...p.0128746.html
you'll get it figured out once you get the pipes strung out under the truck. originally the systems may have been one piece but then they were probably hung before the axle went into the truck