Nitrous for street truck?

[Tucson38]

I have an '85 GMC 3/4 ton 4wd 350 all stock, 790 cfm Edelbrock Q-jet. When towing my boat through the mountains I'm struggling up some of the hills in 2nd gear which limits my speed to about 35 mph with the SM 465 trans. Can I safely utilize an Edelbrock or similar nitrous system w/50 hp jets to us on these hills?

I considered a tranny swap to a six-speed for better spread between gears but wasn't able to come up with anything that would work. I'd lose my granny gear and in most cases have a trans with 2 overdrive ratios so I'm looking at something to give me a momentary boost.

Appreciate hearing you opinions on this project.