I always set my trailers up so that the street side (where the drains are) is a little lower than the curb side...not 2", that would be really noticeable inside, but, usually 1/2" to 1". That does a couple of things...helps to get the liquids, gray and black flowing briskly which, in turn, helps push any solids that are in the tanks towards the "exits"
An additional benefit, it makes the A/C condensation on the roof drain away from the "living" side of the trailer. I also tend to make the nose, also, 1/2" to 1" higher...this makes the A/C drain off the street side rear corner...hate having cold A/C water drip on my neck when moving around the trailer getting things
If you aren't in a FHU site, I would still set up as above to manage the A/C runoff...
If you notice, most well designed dump stations have their road/pad banked so that the trailer tilts towards the drains to aid in emptying the RV's tanks. If I'm pulling into a dump station and I notice the pavement is level, I'll put a block under the curbside wheels before dumping to tilt the trailer towards the drains.