Looks like you are settled into the right class of trailer but you also need to pay attention to the hitch weight. The trailers floor plan can put more or less weight on the tongue depending on for instance where the kitchen is located (at rear or at side). A few years ago I towed with a Mercedes GL450 that had 7500# tow capacity but only 600# hitch weight capacity. Even with an ultra-light trailer that had a 480# advertised hitch weight it was difficult to stay under (advertised weights typically don't account for the weight of the battery and propane, 2 items that usually are installed at the front).
With the LX470 you may won't to confirm if it has auto-leveling and if so, can it be turned off. A smoother pull is achieved with a nice weight distribution, anti-sway hitch (like the Andersen WDH) but WDH's actually work against the auto-level function and need to be turned off. If yours is auto-level and can't be turned off, then stick with a hitch that does anti-sway only and let the autolevel take care of weight distro. Lastly, shop for a hitch that not too heavy (Hensley's and Proprides are heavy) since you don't want to use up hitch weight capacity too much on the hitch itself.
Our TT was just the 2 of us and we chose one that had a Rear Living style. It put the kitchen on one side and theatre chairs on the other.
Good luck with your travels.
