37' is getting close to the "Big Brute" class & with it goes the unavailability of CG sites. The private CGs will usually cram you in one way or another but the SPs & more so the NPs can be a challenge sometimes.
Ours is just under 36' LOA but the model number is 34. That is what I use. I have not found a so-called 30' site yet that I have not been able to get the thing into. Most SP operators are very easy to deal with. The attitude is, if you can get it in & are happy, we are happy. Every once in awhile you will run into Sgt Bythebook. If the site is 35 & you are 36, nope, you can't have it. Grrrrr!