Haven't tried other activities, as my wife still has not completely forgiven me for buying the svx 3 years ago via eBay long distance (even though I had a japanese mechanic specialist check it out b4 I flew up to buy it/drive it back home.).
However, I have carried a lot of stuff in it, with seats folded down.
Most recently, 4 extra wheels/tires, plus 1 extra tire, plus briefcase, plus overnight bag, pus assorted tools.

Interested in the other activities. need to re-woo the wife, try out the front seat fully reclined.