I think the attitude is in your interpretation. They have simply said that they don't provide an infrastucture for over length vehicles. Unlike other states, they don't say that for a few $$$ you can buy a permit and cause problems for other drivers. Even states that offer permits are probably going to limit it to travel between two points on a given date. This isn't any different than a shopping center posting "No Semis" because their lot wasn't designed for the weight.
45' for a motorhome and 65' for a combined length is sufficient for all but a small minority. The longer diesel pusher MHs are running 40', as are Prevost and MCI. On the other board, you mentioned a 52' Volvo coversion. That would require putting nearly a 40' box on a Volvo tractor. (longer, if you use a daycab) Which in turn, is going to require at least a 10' frame stretch and probably more like 15'. You're talking a 35' wheelbase there with a 12' overhang.
I don't see how this is any different than the 102" width restriction. Maybe what your title should have been is "No overlength rigs welcome in Oregon". But if you think they're restrictive, you don't want to travel through New England.
-lee
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