RR Sport SC Tires

I recently traded in my 04 Discovery for a 06 RR Sport SC.  I live in Buffalo so we get our share of snow.  I love the sport but it does not handle the snow like the Discovery did.  Also the truck seems to be all over the road.  The dealership aligned it for me twice but it still pulls, I really can't take my hands off the wheel at all.  The tires are fairly new but I think they are the problem.  Anyone with similar circumstances?  Any suggestion on a all around tire for the 20" rims?

Are they the stock rims? 

Being an 06, there was obviously a previous owner.  Could be a bent rim.  It might be worth finding a tire shop around you that does Road Force balancing, they'll be able to correctly match the tire and the rim to make it as even a circle as possible.

Michelin Energys are what I have on my Rover, but I just checked TireRack and they only go up to the 18s.  Also..I imagine your level of snow would place much more emphasis on the snow traction (the Energy rates mid-low on snow traction) than I ever consider down here in Raleigh.

Shouldn't the dealer be worrying about correcting the pulling since you just got it? 

20s with low profile tires, they are not terrible in the snow and probably a blast in the summer but just not what I was use to.  Discovery would go through anything with no worries.  Last owner drove low miles, and put snows tires on it in the winter so stock tires only have like 4-5K on them.  Maybe snows are the way to go.  Probably not cheap though finding snow tires for 20" rims
 
Absolutely the dealer is going to correct it.  Sometimes it helps to tell them where to look.  I appreciate the info