I just installed an AWE dual rear exit with resonator on my 2020. The system is absolutely beautiful and from what i can tell sound nearly identical to the corsa, maybe 'slightly' louder. I'll take some in cabin sound readings and compare to what was posted here.
2k for running boards that you could sell or re-use seems a LOT more viable than renting a truck or buying a new one just because of the access reasons.
you could also buy folding bed steps like this to fix it, again re-use them or sell them and you are out max 150 bucks...
I looked into putting a dual exit exhaust from a 2021 on my 2020 and was told the flanges on the end of the downpipes where the exhaust bolts up are opposite on gen14 but otherwise should work. I'm not sure about the turbo side but I seem to recall there is a difference there as well.
These are good deals, wish i saw this 2 weeks ago prior to buying/installing my 5100's. For those considering doing it, JUST DO IT, the 5100's on the rear made a HUGE difference in ride and overall road behavior.
Unfortunately I bought the other version which is now not supported according to Master thread.
If I had one I'd let you use it, I'd like to find one to use/rent as well