I found a really useful glitch for selling loot easier. When you sell stuff, the merchant runs out of gold really quickly, so usually you have to either find another merchant or wait 3 days. Well, there's a glitch that will reset their gold.
After you sell stuff and they run out of gold, save. Then attack them until they turn hostile, then load. Talk to them again and their gold will be replenished. I think the NPC has 2 assigned inventories, 'merchant' mode and 'attack' mode. When they switch, the game forgets the state of gold in their 'merchant' inventory, even in between loads. Really useful. Overall, I had like 3000 pounds (weight not value) of stuff to sell that would have taken real life hours to sell with other means.
I use Tonila of the Thieve's Guild since she buys items of any type, as well as stolen stuff. If anyone can point me in the direction of a merchant that has more than 1000 gold, and buys all item types including stolen, I would appreciate it.