unless you are touring, you may want to consider as a backup amp a magnum 44 pedal
they are small and economical, and it beats unloading and watching/securitying the backup amp at a bar with potential lowlife
Tremoverb... post-2010 3ch Dual
If your goal is to save money and retain the Recto vibe then a Single will work but if your goal is Recto tone or really any tone that isn't abrasively buzzy in the top end and insanely stiff feeling then I'd go elsewhere.
I honestly don't remember my old Rectoverb sounding like that, but then again it's been 7-odd years since I've had it and my tastes have changed. I do remember it feeling stiff in a certain mode but I didn't use that mode anyways.
My current amp is a 3-channel amp that will handle metal. I'd like a 2-channel amp that does rock, although in a similar vein, tonally. Maybe I should go for a 2-channel original Dual (which is basically what the Tremoverb was, but without tremolo and reverb)?