We have been looking at 5th wheels for several years and are ready to buy. We like Heartland products, however if you read long enough you can find good and bad in all brands. We like Bighorn 3570rs as well as Big Country 3521ts. What are the real differences in the two models? We would like to stay at 38 feet and 14,500 loaded 5th wheel weight. We will also be purchasing a truck , either 3500 SWR chevy/GMC diesel, or 3500 SWR dodge diesel. We won't be full timing , a few long trips during the year and weekends. Would love to hear from folks with the experience. I'm finding I'm disappointed with most salesman. Most don't know their product and will try to tell you anything, even when what they are saying is totally false and could be unsafe. Thanks for your input.