105Ah deep cycle battery, where should I place it inside the van or out side? I have a small cupboard on the floor beside converter inside our 2003 Jayco Freedom or a full width tool cupboard at the front of the van on the out side.I would welcome any sugestions you might have. thanks Bruce.

Check to see if there is room inside engine compartment, i would not place inside vehicle 

If you have the battery inside the Vehicle the gas of of the battery is very explosive so you want it vented well. Do not put it in the compartment with the converter because gas from the battery can build up and the converter could cause an explosion. Also the gas is dangerous to breath in. It can cause Brain aneurysms if the fumes are breathed in. So if at all possible put it out side and inside the frame rail to keep it from being hit. Also use a Truck kill switch cost about $35.00 and will carry up to 200 amps of draw on the battery that way if you have any problems at all you can disconnect it with the disconnect switch. this is a safety device to keep you safe in case of an accident. You should use the newer dry cell batteries to get rid of the gassing of the battery. If you need more information let me know.
Avid 101

Outside for sure, never inside, very dangerous. Is this a trailer or Van?