How limiting will this be?

tealboy wrote:
If I were to purchase a 40 foot non tag axle DP to travel across the US to visit national parks and other must see places, how limiting will the above be for me? Intend to have a small tow vehicle behind me and wish to visit Yellowstone, Zion, Grand Canyon, Acadia, glacier , etc.

I’m avoiding consideration for a 44 tag axle unit due to size limitations but realize the 40 footer could be a problem too, not sure.

This has came up many times and it seems that those who already own larger rigs, don't have the problem, but with those who don't, it's going to be a problem.
I think you'll be fine and with the few times you won't, it'll not make that much difference in overall ownership and extra comfort.
I've also found that most campground owners, don't have or don't know how to use a measuring stick, so one can easily size his rig according to the rules in most cases.