Hello and welcome to the forum.
I also joined the forum recently and we have a 2012 2503S that we got last August. I tow with a Nissan Pathfinder 6cyl, rated for towing 6,000#. When combined and loaded I weighed (at scale) just about 1,100# under it's 11,300# all up limit. I'm not recommending that, just saying it's the set up I have. The guys above are giving good advice.
The reason I'm chiming is to add a different perspective. For me this set up works for now, mostly because in a days drive from here I can encouner hills not mountains, and the RV is for vacation camping for another few years. For future I have my eye on the 8cyl Pathfinder, rated 7,000#, and it should be good enough for our retirement travel plans. DW just won't agree to being on the road for long periods so I envision slow and steady will get me there "eventually". But I'm still not recommending that set up either.
The other reason is that I will be interested to know what you think of the 2503S. We love ours. I was sold on the murphy bed arrangement, she was sold on the "space" of the cooking area, (cause the dog and I were always in the way with the 3 previous RVs). But the bathroom and its separate entrance did it. No more wet dog flying in and all over every where! I can contain her in that big area until she's dryed off and cleaned up.
Also when its a mucky site the dirt I track in doesn't get everywhere. Winner!
So drop me a line with your impressions and if you're interested I'll let you know about any quirks or surprises I find about the 2503S as time goes on.