Having trouble posting. I'll try again.
I used to tow a '69 International, 31' tandem. I now tow the '92 Limited, 34' triple axle. Towing is not much different in most ways. It took me a while to get used to the third axle - no real difference, but at first it felt like it was 20' longer than the old one (the power of the mind is interesting!). Clearance seems to be no difference. I carry no spare but I still have the spare tire rack and I've never scraped it. The rear overhang was an issue with my RV pad at the house. Long story made short - I modified the sharp incline of my driveway and since then I'm OK. Normal towing is no issue at all (other than exercising reasonable caution in risky places. Bottom line: I wouldn't worry much about it.
'92 Limited 34ft (now sold); '96 Dodge Cummins 4X2, 5speed