The eco comes in all models of 1/2 ton ram except for the sport I believe,from plain jane work truck all the way up to the limited like mine. I am very happy with mine overall with a couple small items like my nav not having a way to shut off the naging woman trying to recalibrate lol. The 40g's sounds about right but I'm sure you could find something cheaper if you don't mind losing some of the bells and whistles.If I had one major thing to complain about would be the fuel milage,most of the guys on here say they are getting 25-28 mpg yet my truck has yet to get over 21. I just was in for a service and asked if they could check for me but the results were "everything is fine just put some more miles on it",so I'm not letting it worry me.The ride and comfort make up for any milage I'm losing.Towing 5500 and carrying 1000 will be fine just make sure your trailer brakes work good.I have a 9000 lb bumper pull rv that makes the fiat work its heart out but no troubles so far. Good luck on your purchase.
Randy
Randy