Interesting and respected observations. I have no doubt that ballast is a positive move for novices and potentially when in the formative miles of riding a new outfit. An early experience of the sidecar wheel lifting, reacting inappropriately, and colliding with a stationary car front wing, all thankfully at almost walking pace, could have put me off the three wheel way forever. For sure, I've heard more times than I can remember guys suggesting they'd only tried riding a sidecar once and "no more". The wheel coming up unexpectedly is an issue and therefore deterrent. Certainly when riding outfits in the USA, factors such as riding "on the wrong side of the road", plus with the sidecar on the "wrong" side has been enhanced by a little ballast in the sidecar, even with the good lady aboard. In contrast, rode a lightweight airhead BMW EML outfit for about a dozen years, sometimes with nothing but a few clothes in the sidecar on windy country roads at more than acceptable speeds with confidence. The sidecar wheel no doubt getting airborne. However, a recent purchase of a rather powerful bike with a significantly lighter sidecar than our trusty K model Beemer's very overweight example of the fibreglasser's art, justified a bag of sand in the boot until I feel assured with my ability to handle the beast. For me, even after a few decades on three wheels, more than justified.