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Otto Billingsley, 8, of Crested Butte, Colo., has some extra spring in his step as he jumps on a Sky Zone trampoline in Rocklin this week. A push has begun to regulate trampoline parks with the rigor faced by amusement parks and ski lifts. Senate Bill 256 would impose fees that would pay for inspections and safety enforcement. The state Department of Finance opposes it.