3years at UPS and 36 in tube Toshiba TV have proved to much for my back! Did my share of push ups in the army.
I use a 2x12 that I keep at work for an auditorium I have access to on the weekends. I take a guitar and my 2ch DR.
I've never played the Roadster combo but have to think it would sound similar to head and 2x12. A 4x12 is no fun to lug around either for the record. If the amp isn't going to move a whole lot, realistically it doesn't make that much difference.