Well, I may be joining the Rumble Club very soon!
I mainly play at church, through the FOH system, and don't need an amp there.
The last few years, I've played elsewhere, needing an amp, about once a year. Most of these have been with a choir I sing with, and I've been able to borrow a system from a co-worker, and it's worked out fine.
Except it's heavy. Randall RB 125 ES Amplifier (15-20 lbs, just guessing), GK Backline 210BLX Speaker Cabinet (60 lbs).
Next month I'm playing with the choir again, only not a normal concert. It's a Choir Festival, Thursday evening, Friday evening, and all day Saturday.
We sing Saturday morning. Each choir has a 20 minute slot. Get on stage, sing, offstage, and the next choir is waiting to go on at the moment you start to leave the stage. I'll have approximately 3.5 seconds to setup and tear down. No FOH, just whatever I bring for an amp.
Heavy ain't gonna cut it. I need to carry this onstage while we are walking on to sing, plug it in, sing, play on the last song we do, unplug, and walk off.
I'm going to try out the Rumble 200 and Rumble 500 both this weekend. The 200 will be enough for anything I've needed, but for only $100 more the 500 gives me overhead in case I need more in the future. You know, just thinking ahead

.
Expect to see an official request to join the club Saturday or Sunday.