The past tense of trust someone as far as one could spit is trusted someone as far as one could spit.

The third-person singular simple present indicative form of trust someone as far as one could spit is trusts someone as far as one could spit.

The present participle of trust someone as far as one could spit is trusting someone as far as one could spit.

The past participle of trust someone as far as one could spit is trusted someone as far as one could spit.