Greetings from Oklahoma. Just traded in a 2014 Heartland Big Country 3650RL, 40' for a Grand Design Solitude 310GK-R, 35'. We're excited and look forward to more travels. The floorplan is very similar but the GD seems to be a little more solid and shorter. Looks to be about the same height and weight which is surprising. Pulling with a slightly modified Silverado 3500HD, DRW so the weight is not really a problem. Hopefully I can participate in the forums and offer some input.