Fresh water tank and instant water heater

I have been reading here for some time - registered today - first post today!
I'm currently on my 3rd or 4th revision of my 7x14 trailer used for off road motorcycle racing.
I have fold up wooden bunks, wooden overhead cabinets, refrigerator, microwave, and a toaster installed.
Recently I got on the shower kick - I installed a on piece 36x36 shower enclosure that also houses the porta pottie.
My questions:
1. fresh water tank will stand upright and need a siphon tube installed - Is that an issue in anyone's opinion?
2. the water heater will need a flue through the roof to exhaust per the seller (marey 1.5 lpm propane) any thoughts/advice on that?
3. plumbing the tank I have the 1 1/4" fill line and plan to buy cpvc for the shower supply - any suggestions or is this the correct route?
I'm currently on my 3rd or 4th revision of my 7x14 trailer used for off road motorcycle racing.
I have fold up wooden bunks, wooden overhead cabinets, refrigerator, microwave, and a toaster installed.
Recently I got on the shower kick - I installed a on piece 36x36 shower enclosure that also houses the porta pottie.
My questions:
1. fresh water tank will stand upright and need a siphon tube installed - Is that an issue in anyone's opinion?
2. the water heater will need a flue through the roof to exhaust per the seller (marey 1.5 lpm propane) any thoughts/advice on that?
3. plumbing the tank I have the 1 1/4" fill line and plan to buy cpvc for the shower supply - any suggestions or is this the correct route?