I owned a Seneca III for a few years before moving up to an Aerostar 602P 700 and the Senneca handled Ice very well and would carry more than my suburban.

if you put the Meryln controllers on the engines they will reduce the strain on the Turbo system a lot.

the Seneca III carried me , my wife and two kids and all the ski stuff you need for them on many trips. I really liked it but when I moved to the Aerostar it was a whole new game 70 knots faster and had pressurization although you could not stuff as much stuff in it and it was more difficult to load. But the Aerostar flies like a sports car and the Seneca did everything I asked but was not as much fun to fly.