Many in the boating community, use these when they pull their batteries back to the house for deep conditioning/equalizing. Trojan needs GT 15.X volts, so getting a unit that has range to cover the voltage level Trojan recommends for your specific battery, is warranted:)!
I've never owned one, but know two that have these, or in the family. Seem to be a decent product, at a relatively decent price:)!
http://www.mastechpowersupply.com/volteq-power-supply-hy3020ex-30v-20a-over-voltage-over-protection-lithium-battery-charging.html
Best of luck to you,
Smitty