Keep blue water bait tanks in mind! Bob Maindelle of holdingthelineguideservice uses the 30 gallon and it came with high recommendation over the three grayline bait tanks that he used/uses. He says the grayline's insulation factor is very weak compared to the blue water bait tanks and the filtration is not as great of a design as well in his opinion. With that recommendation, I purchased a 30 gallon blue water for $590 plus $110 shipping and I couldn't be happier with my tank. Even in these 100 plus degree days I have had no problem keeping shad alive a day or two in my driveway with little to no maintenance. All I have been doing is adding maybe 1 gallon milk jugs of frozen water in there once or twice a day. This keeps the water in the 80-84 degree range which is about what the lake temp is running.
If interested, I made a video of the tank just to give others a close-up view and some details of the tank.
https://www.youtube.com/watch?v=1CLkwu5jtiQ