Not that you're wrong, but my experience with our Triton 430 is somewhat different. At the end of the season I lift the van by placing a trolley jack under the axle in order to slip tyre protectors under the wheels. Allowing for the thickness of the tyre protectors, the lift required is probably what you'd need if pulling the wheel and slipping on a replacement and the first time that I executed this little exercise was surprised by the amount I had to pump up the jack in order for the wheel to clear the floor which is undoubtedly down to the amount of lift required to overcome the suspension. I wouldn't know for sure because I have never attempted to change a wheel on the side of the road, and neither would I even consider it, but I would imagine that with a van loaded almost to the maximum allowed, then the effort and degree of lift required to overcome the suspension compression would be even more.

Slightly OT, but I wonder if any member(s) have actually changed a wheel by the side of the road or motorway etc. When laying on the floor where our van is stored in order to place the trolley jack under the axle, my legs are splayed out in all directions. It's not exactly the easiest or cleanest of jobs in the world and in my opinion, one of the most hazardous exercises that one can conduct with the caravan. One minutes lost concentration in terms of where your legs are positioned and oops, they've been run over by a passing lorry.