They do make a T-harness with converter, and unlike the '14~'15 gen2's where they forgot about the righthand taillight, the gen1's do have all the proper connections
provided it's a tow-package equipped SV. If not, the harness will still work, but you might need to do some wiring for the righthand lamp. Here's a link to the instructions:
https://www.nissanpartsdeal.com/resourc ... /1ui26.pdf
The SV's have a 30A fuse connection for the trailer brake, but I don't imagine you'll have those on a 300 lb rig. However, if you don't have a trans cooler installed, get one, and be prepared to decrease your fluid change interval. Towing anything heavier than a bicycle puts weird and unique loads on the belt!