Most of the advice on this forum is invaluable. If we had listened to the dealer we would not only be pulling a trailer well over our payload but with a truck struggling to tow it up moderate hills. The dealer told us "no problem". Don't let the allure of the fancy trailer cloud your judgement on the capabilities of your tow vehicle. It is THAT important!
Don't aim for something that is right on the limits of your tow vehicle's capabilities either. There's a reason many people here say you'll be upgrading your TV soon after buying such a trailer.