Nobody runs chains. Chains used to be popular many years ago when snowblower tires had 1/'4 inch and 1/2 inch treds. Now tires have 2 inch treads with big spaces. I have a very very very steep driveway and have never had a problem.
When I got my Ariens 1332 I was freeked out how much it was pulling to the side. That was three years ago....once I adjusted it, it was fine. Now it spins on a dime, it feels SMALL, in any snow condition. But there is one important adustment you must make (if it is off). Study the book, but I will try here from memory. The unit comes it two big pcs...two halves....they are the Engine/Wheels and the other half is the Front Auger. If the conecxtion of these two halves is twisted or not alinged, it will pull. THis was the problem with mine. Do the following:
Find a flat smooth surface.
Loosen the all the hardware that touches the ground (scraper bar and the two side guides)
Wiggle the machine and look at it from the front. You are trying to see if the two major halfs of the snowblower ( Engine + Auger )are aligned. If the auger is $#%* eyed, you are going to have to fix this adjustment (not too difficult).
If it is cockeyed, just to make shure, move the machine to another flat surface in case your first flat surface wasn't really flat.
If it is still cockeyed, you need to read your manual on how to change the belts. One of the belt replacements REQUIRES you to seperate the two big pcs of the machine (Engine and Auger). So read that, don't actually pull the two parts apart, but just loosen the bolts, re-align, and now adjust the scaper bar and whatever those guides are called on the sides. (previous authors in this thread talked about that).
You then will be good to go.
Good luck!