Level Trampoline and Optional Drain

I need someone experienced with levelling outdoor structures to reset a trampoline on a sloped area of the garden. It’s already in the final position (photo attached). The ground is uneven, so the job involves digging pockets for the uphill legs, building up the downhill legs, compacting the soil, checking level from multiple angles, and securing it so it’s stable and safe. Optional extra: If you’re familiar with bathroom fittings, there’s a stuck click‑clack drain that may just need loosening. Not essential, but great if you can take a look. Looking for someone who has done similar levelling or ground‑prep work before and can ensure the trampoline is safe and stable.