I just purchased a new 2013 3650RE, it was between that and a 2014 3650RL. I spent WAY too much time comparing the two. There are a few changes between the two, I'm not certain whether all units come this way or not. Her are the major (IMO) ones on the two units that I was comparing...... 2013 has a 90lb permanently mounted propane tank and a 25lb exchangeable tank. 2014 has 2-30lb tanks(they might be 40's). 2013 has room for 2 batteries and has a 1000w inverter. 2014 has room for 4 batteries and a 1800watt inverter. (It looked to me like there was room for 6 or 8 ) 2013 has dimmers on many of the lights inside. 2014 does not, just off/on. 2013 does not have a oven, only a microwave w/convection. 2014 has a oven plus convection micro. 2013 has drawers where the oven would've been. 2013 comes with Goodyear tires. 2014 comes with a brand that I've never heard of. 2013 has a air bag on the hitch, 2014 has a rubber bumper. I hope this helps....