A 7 passenger built on an E150 chassis can not be safely converted, but a 7 passenger built on an e350 can. The e150 does not have enough spring rating and if it is an e150 that was built before 2007 the brake system is to small as well.
Behind the passenger kick panel
how do u replace passenger armrest on 2007 Chevy conversion van
How do I replace the heater core in a 1999 Ford e150 conversion van
The companies that offer van conversion kits are: Convert Your Van LTD, CamperVanLife, NorthWestCamperVanConversions, Pathfinder-Vans, and Hoosiervan.
How do you replace sliding driver side rear window in 99 ford e 150 conversion van
try looking on the passenger side side panel under the dashboard should be a little black button?
Pour
6x8
Depending on the model of your camper van, it may be slightly difficult to convert properly. You should have a look at a YouTube video prior to attempting the conversion of your camper van.
Top of the engine, on the passenger side.
5 qts
In the gas tank!