Old school trailer leveling is you level side-to-side by driving the low side up onto wood or leveling blocks, then use the tongue jack to level front/rear. Once all is good, crank down the stabilizers.
A few Years ago, Lippert started selling an automatic leveling system called
Ground Control TT that enables you level a trailer like you would a class A.
Use the mobile app to have the jacks auto-level or you can operate them individually. You probably haven't seen a lot of these around because most folks camping in a TT don't have an extra $3k to spend on something like this, nor do most find leveling to be that much of a chore.
Yes, a weight distributing (WD) hitch is advisable even for lighter trailers, since most have integrated sway control that really helps. Without getting into specific numbers, most folks stay under a 6k lbs GVWR TT for a 150/1500 truck. The key point is that the truck will run out of cargo capacity to handle the 15% tongue weight of the trailer long before it reaches its towing capacity.
