The only thing i would say is that on past experience that size diesel pickup will drink fuel and u will probably be crippled if u drive a long distance as i've never found them that comfortable. Would also most likely be pretty steep on road tax etc. Don't quote me on it but that's what i have found with new shape L200 and hilux trucks. I'd be more inclined to go for something like the tdci mondeo estates (can be picked up surprisingly cheaply) or something like that. More than enough grunt to tow your roadster and a damn sight better on fuel, comfort and road tax too
Russ