Ground tents and swags are great for a two to three day trip then get uncomfortable IMO.
I disagree. I’ve never been uncomfortable in a properly appointed ground tent.
It’s the convenience factor of a RTT that is significantly higher in my experience. Long road trips like I do can benefit from that convenience when driver fatigue sets in and you need to pull over for a few hours sleep. Swags are a bit awkward in settings like rest stops in Texas