I'd be curious to ask Mr. Landreth if his interest in having a portable substitute for back line rental amps is based on experiences of encountering poorly maintained amps that have definite operating malfunctions or if it is based on encountering well maintaned amps that do not give him the tone he is looking for.
My personal interest in guitar amps includes, and is probably preoccupied with, the mating of some special speaker to the output transformer of the amp.
Most hand made amps have more in common than they have difference and so, IMO, the choice of speaker is a definitive ingredient in the over all experience.
My guess is that Mr Landreth owns enough hand made amps, and has enough experience with them to know what he likes so I would be real curious to learn what specific goal he was hoping to meet by being able to cart his own small format amp around, and I would be curious to learn what his thoughts are about speakers are as well.
I only know a bit about him. The first time I saw him I thought...
"wow did Albert Lee get younger and take up playing slide?" and then I looked up the video credits and learned that the guy playing such hot and steamy music was named Sonny Landreth. :-)
best regards,
mike