I'd too have been considering the possibility of a slide-in rather than hauling (in my case, a
[email protected] Boondock) and like you, looked spcifically at the Scout. You've identified the two issues: weight and overhang. The Scout Yoho is nomimally 960 lbs and will be over 1,200 outfitted with a heater and other options that I need. The R1T has a payload capacity of 1,760 lbs, leaving about 560 lbs for passengers and gear once the Yoho is in place. That's marginally acceptable.
As you've already identified, the bed is the real issue and specifically how much the Yoho overhand changes the CG of the R1T. I'd be curious to see if you can get the data for the rear axle positioning so that you can accurately determine if the Yoho would work. My guess is that it won't, which is why I opted to pre-order the R1S and stick with hauling a teardrop.
In the interest of full disclosure, I'll reveal that I also put a pre-order on the CyberTruck, which, with a longer bed and payload double that of the R1T, will easily will work for the Scount Yoho and possibly even the Olympic (length is the only potential issue). The tri-motor CT also has sigificantly more range han the R1T (500+ vs 400+ miles). There are other issues with the CT that I need to overcome however, not the least of which is spousal oppostion to what is admitedly a pretty ugly design. Still, since it looks increasingly likely that the 180 kWh battery package will not be available on the R1S for upwards of two years or more, the CT may yet win out.