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An RTI is a ramp travel index. That being said if you were on a 20* ramp you would have a RTI of 868.67.
http://www.therangerstation.com/tech_library/RTIcalculators.htm
would that be considered good for a weekend warrior truck with a 138wb?
I think a better question is whether your truck performs offroad the way you want it to. The RTI method of testing offroad vehicles is kinda dated since it doesn't give you a true indication of how well the vehicle actually performs. Ie, it is possible to have a vehicle that gets a monster RTI score but doesn't actually perform very well offroad, but there are vehicles that get good RTI scores and perform well offroad.