I have run wfp out of an estate and I seriously considered a people carrier size vehicle and/or a trailer.
In the end I went for a van and we had a small family car - now my daughters are taller than their mother (no big acheivement, mind) we went for a bigger family car Pug 406 Estate.
If it was just me or me and Mrs Gold and we worked together (with say occasional visits from grandchildren or take granny out) I would prolly go for a people carrier and stick with one vehicle.
Or a trailer .... (see I can't really make my mind up!

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At present - a van and separate car is a no brainer for me.
But a trailer is tempting as well if I were to set up a small second system to run part-time off of the car (but also because I would use it for camping/cycling/firewood etc.)