Motorhome jump starters & pumps

In the March 2012 Club magazine (pages87&88) the club reviewed 6 infaltors. One caught my eye because it was also a jump stater (Streetwise 12v Jump starter with Air Comp). But when I tried to order one the guy said it wasn't a good jump starter for a diesel engine. Can anyone recommend such a beast that will inflate motorhome tyres to the higher level than cars and be able to jump start a diesel engine?