Towing things with a Squareback

[A bear in his natural habitat <burden@rhett.ENET.dec.com>]

We're planning a 2 week driving vacation next summer and one thought I had was 
bringing our little 1957 BMW Isetta along for fun.  For the long distances I'd 
like to tow dolly the Isetta behind our '71 Squareback (manual tranny).  I have 
yet to fabricate a trailer hitch or the tow dolly, but the Isetta weighs about 
750 lbs.

If we cruise with 2 adults, 2 kids (50 lbs each) and camping gear, tools, etc, 
is dragging 750 lbs behind the car going to be a problem?

The Isetta will have to dragged backwards, which means the tow dolly wheels can 
be about 3 feet apart, which also means when it's not in use I can probably 
strap it to the roof rack on the Squareback.

Thanks
Dave
Woodstock, GA