Some floor plans are popular across several manufacturers and brands within manufacturers, but will be different in weight and quality depending on the marketing goals. The goals that vary might be intended price point, what seasons the RV will be usable, and weight targets. The differences in the trailers can be type of construction, capacity of frames, weights of materials, quality of materials, choice and quality of fittings. For example, an "ultralite" might have 1-inch walls instead of 2-inch walls, and every other material in the construction is thinner or lighter weight, even though construction method is the same.
Then, there is the case where 2 or 3 brands or model lines are just non-identical twins, done with different names and decals.
The best source of where the manufacturer tries to place a product, how it is built, why it might be special, is probably the sales materials (brochures and web sites) although some manufacturers are better about this than others.
With a full-size SUV which tends to limit tongue weights, you are probably looking for lighter weights, and manufacturers will definitely advertise that.
