This looks to be another case for adding the weight of a scopes' OTA to the descriptions/specifications supplied in the descriptions of telescopes. About all I can think of as belonging on the 'short-list' would be a small (102mm?) achromatic refractor - maybe?

The HST - Hubble Space Telescope - would certainly fit the bill. Of course transportation would be quite expensive......

I'll get my hat -

Dave

 

The Vixen VMC110L Mak-Cass comes in at 4.6 lbs and 110 mm aperture. It might do the job.

 

I think the ideal largest aperture scopes for the DwarfStar would include:
-C5 SCT (stated to be same length and weight as C90)
-Orion Starblast or equivalent (4.5" F/4 Reflector)
-the 102mm F/5 refractor mentioned by Dave

The only one of those three I have used is Starblast, which is now my main grab&go scope. One nice thing about the reflector is that the ergonomics make tracking easier than CAT or refractor. I find I can conveniently put a light touch at each end of the scope simultaneously to move the scope, as opposed to grabbing a diagonal and adjusting from just one end of the scope. I get better control with the two-hand movements.

I have found the DwarfStar to be plenty strong. I have used C6, C102, and ST120 on it at lower powers. Far from ideal, but it's nice to have such an option for travel. I was very much torn between the 114mm F/4 reflector and 130mm F/5 for grab and go on DwarfStar. I suspect the 130 F/5 would passable in terms of stability, but bulk and awkwardness for carrying would be substantially increased. I wanted a one-handed carry and the Starblast has been great for me.

 

My 5-inch Mak's OTA is supposed to be a hair under 8 lbs. That should do nicely.