My Land Rover tows with OD on, but there's a "sport" button I'm supposed to push that does just like Ferm said... moves the shift points a little higher and keeps it locked a little longer. Never had a problem with it yet. (crosses fingers). You can tell it's in sport mode though just listening to the engine.. it winds out longer before the tranny shifts.
My previous tow vehicle (1998 Jeep Cherokee Sport with a 4.0L engine) says to tow in 3rd gear.. but I always towed in OD with zero problems except for when I was in really hilly areas.. and several of those tows were to Fla and back hauling my V20. up and down Interstate 95. That Jeep has 177,000 miles on it now and needs a new head gasket, but other than that it's in great shape.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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