We have a 2009 Coachmen Concord 275 with 2 slides , diesel on the E-450. We have been looking at a 2015 Concord 300DS because of the counter space on that model. The new Concords have several new features we do not have on our 2009. The 2015 has a leveling system that we do not have on our 2009. The 300TS with 3 slides has a very small kitchen area. If we go with this model we will get the new Triton V-10 gas. Only me and the bride so we have lots of space to get comfee and not have to worry about crowding each other. Over the past 40 years we have owned TT, class A and class C , we prefer the class c's because if I get sick or hurt the wife can drive me home from anywhere in the country. Leaving tomorrow for a round the USA tour for about 8 weeks.