Probably need to look around the I75 exit at Lenoir City for the best/newest options - Hampton Inn, etc. Closer to town on 321 are some less-new motels that may be OK. Some of the LC locals can, hopefully give some specifics.
The Fairfield Inn was really good to me. They have limited access to power outside but it is there and they made it available when I asked. Plenty of room for your truck and rig. This is a new property so it's clean, in good order.
Living in that area I have stayed at a lot of the and none of them are really set up for boat and trailer with power. parking not usually a problem just not set up for fishermen.