Why you can't use the rear Tork-lifts with out the front is questionable???
I would consider removing the running boards and just get shorter ones and store the long ones or sell them. With truck camper on the back, the running boards extending back to that area are useless.
Something else to consider, to have a truck modified would affect resale and most important: Having the camper secure to truck using the Tork-lifts all around is a matter of safety. If your welder doesn't understand the movement or loads when fabricating, you run the risk of the camper coming off truck. Not to mention you would be liable for damages to others if that happens.
Consider the Troklift fast-gun tie downs also with locks.
Truck campers are fun and mobile, safety should be a priority over anything else.
Just my 2 cents!