Just our o2 worth having now ridden the bikes fully laden for a while - note F798's. We have the Altberg foot enlarger and one of the issues is that it sticks out in front of the foot.
The result is that when putting the stand down the front of the foot tends to dig into the dirt and for Sally it's too hard to lean the bike over to the right far enough when it's fully laden with gear.
If I was designing one it would extend the foot only to the rear (and as much as possible) and leave the front (when viewed with the foot fully down) as close to original as possible.
We also find that even on level ground the bike has a lot of weight on the stand even though the Altbergs add about 4mm height, but that could be because we have a different stand completely... not sure.
Don't just look at it - Ride the bloody thing!