Rob,

Larger tires than on the Scopebuggy? They are already something like 10" in diameter and wide with a heavy tread, larger than that and I think you're into much heavier ATV or small car wheels. I know the standard JMI wheelies use small hard wheels which would have a difficult time on a gravel driveway (JMI does have an option for the larger wheels) but the Scopebuggies wheels are considered large and soft. If you really need more than the Scopebuggies wheels then you are into some serious "off roading" ... lol.

There isn't a lot of ground clearance at the front wheel with a Scopebuggy so abrupt changes (sidewalk edges, potholes, etc.) would be a problem but I have no problem taking a Scopebuggy over what is considered a rough driveway or lawn. Stones up to about 2" are not a problem.

I've seen a few homemade configurations pictured here on CN, including a few really creative dolly type setups for alt az mounted scopes. I like the idea of two wheels and lifting the third leg for shorter runs with only the mount. I already do something like that (lift the front wheel off the ground) when I'm going over edges and such with my Scopebuggy.