Beefy but portable 337 tow bar options
 

What do you recommend?
I've noticed Spruce sell a Twin Cessna bar with 5/8 lugs. It's a little longer that the single Cessna bar, which you need with a 337. Spruce part 13-01850.
The price seems right. $85

On the other side of the spectrum is the Bogurt model for the 172RG/210/337 looks very nice and beefy, runs about $200.

Anyone have experience with either?

I have this one from Spruce
13-01540
It is really nice for my 337. I like the way it stows too. Plenty heavy enough

The Bogart is nice too and I use one on another plane I fly. I still think the above unit works just as good and much less expensive.

The G model doesn't have the lugs I mentioned. Looks like I need to go with the hollow nose wheel options 1 1/8". The Spruce bars are made by Wag-Aero and 56" long extended. Ordering Spruce 13-0110 aka. Wag-Aero M-340-020