Definitely go with the Rhino in my opinion. I have flown the Viper with a P-200 and a Titan and I think the Titan/160 or 36 lbs similar thrust is the best combination. I don't think residual thrust would be a problem on the Mammoth but it would land slower with the Rhino in it. The Viper carries energy very well and we were asked by a lot of people if we had a P-200 in our Viper.

Andrew