I prefer the Carnival over the Previa. SWB variant length is pretty much the same as the Previa, costs about half as much and with better fuel efficiency. This one's made with the American market in mind, so safety, space and ride comfort is a given.

But then both of these wouldn't have much cargo space left with all the seats up if you load the wheelchairs, so we return to the LWB Carnival. The LWB Carnival is 32cm longer than the SWB. Though significant statistically speaking, but really not much to be too much of a trouble in manuevering, especially if you invest in proximity sensors fore and aft and a backup camera.

Its not really that much of a hard task driving large minivans, considering that many American moms drive these on a daily basis. Minivans were first and foremost designed for "soccer moms"!