Venting gen exhaust thru RV garage, need suggestions please.

Yes, we have a 50 amp service in there,
the plan is for exercising the generator monthly should we not have used it for a long period of time, and also
might have my electrician set it up to feed the house when needed. (hadn't thought of that)

We seem to have a long outage of about a week or more every couple of years.
and we can always stay in it if the power is out,

either way , I need to be able to run it while in the garage.

Thanks for all the comments.