I was rather obese (350lbs 5' 11") but managed to lose about 75 lbs, gained some, lost some again, and so the battle of the bulge continues (I've launched a new offensive recently). But I am still fat. I'm not a regular visitor to MTL but have enjoyed about 8 different SPs from Montreal, and 2 outside of it.
The problem with asking the agency if its a problem is that you will often not hear the truth. From my personal perspective none of them appeared to have issue with my weight. None had knowledge of my weight before hand except for indy whom I had sent my photo beforehand. Its not something I would do normally, but she was an HDH and I wanted to make sure there would be no problems before hand.
First and foremost Hygeine is key, but dont go overboard like I did. I thought I had to overcompensate and ended up doing quite a bit of waxing - very painful and all the SPs I was with said it was unecessary. But still, pay attention to detail, treat her nicely and it will pay off. I always let the SP go CG first and then we explore what works best from there.
With regards to what EB said, in my opinion someone with that much weight will have a hard time pounding away - physical stamina and flexibility is not one of the great attributes of obese men, and while there is plenty of sexual energy, I doubt they can pound away for as long as a healthy man can.
In addition dont forget to do your research, I did my homework and only had 1 out of those 8 experiences end up bad. And it wasn't my fault either, the problem was with her (garlic breath and unclean Y). Almost each SP I was with asked me when I would be again in town, and one even made some arrangements to see me the next day under the radar (without the agency owner's knowledge).
Larry feel free to PM me if you are looking for fat-friendly SPs. Though I'm sure you understand every experience is unique.