Towing an Airstream with K5

[kiley]

I put this in the Blazer forum but it's going a little slow so here it is.

I'm about to get a '78 31 foot Airstream travel trailer. I'm concerned about towing. I'll be going through mountain passes alot. I currently am set up with 33" tires and 3.73 gears, fairly stock 350 and th350. Should I be concerned about going to different gears? A 383 will be in the future so should I just get by until then?

I'm about to install ARB air lockers in the front and rear and don't want to do it twice.

Thanks for your input.