HELP! Can I Have This Set-Up With A Class B ???

I'd worry about the B's transmission capability for such a load, especially if you're considering mountainous driving. That doesn't include other concerns about braking, engine temps, etc. Motorhomes in general (B's and C's) just don't have the ability for big loads after you've included passengers, cargo, fuel, etc. You could maybe pull a tent trailer with no problems but bigger stuff will probably not work out too well.