Our dealer recommended & installed the E2 for our Lance 1685 (21' 3800# dry weight, approx 5000# loaded) with our Toyota 4 Runner. We have the 600# round sway bars. We're happy with the recommendation after 10,000 miles+. Being a newbie, my guess is that the TV & trailer combination will influence your decision. I will say the E2 is VERY noisy -- snap crackle pop -- took us a while to realize that it was "normal" and not falling apart every time we backed into a spot. Not sure if this is common to all WDHs since we only have experience with our E2.