I know my Host has the dump valve in the basement and cable operated control accessible near the discharge port. My entire gray tank sits just aft of the fresh water tank and forward of the axle. I believe some Lance models also used cable controls to keep the valves inside.
I do not think you will be able to to a lot without taking the camper off the truck and removing the lower camper floor cover. But I have never seen a Corsair camper, so they may be different.
The forward location of the sewer dump valves sounds unusual to me. Where is the bath room, as the the black tank is usually underneath the toilet. And the rest of the plumbing runs to the rear, towards the sewer hose connection. In all the setups I know, the valves have always been close to the sewer hose connection.
2014 Ford F350 XLT 6.2 SCLB + 2017 Northstar Arrow
If it really is hidden you could probably switch to electric dump valves and a 12v masorator pump with a remote switch to drain them.
2022 Ford F150 Sold: 2016 Arctic Fox 990, 2018 Ram 3500, 2011 Open Range Sold Forest River Forester 2401R Mercedes Benz. when campsites went from $90 to $190 per night.
Where is the sewer hose connection for dumping? If the valves are located toward front of camper does that require off loading to dump or are they remote/cable operated?
You didn't put the camper on the truck backwards did you? 😉
But seriously, take it off the truck and if that doesn't give you access about the only choice is a sawsall...but I'll bet taking it off gives easy access.
Tammy & Mike Ford F250 V10 2021 Gray Wolf Gemini Catamaran 34' Full Time spliting time between boat and RV
love to see a picture of this setup and location of valves
2022 Ford F150 Sold: 2016 Arctic Fox 990, 2018 Ram 3500, 2011 Open Range Sold Forest River Forester 2401R Mercedes Benz. when campsites went from $90 to $190 per night.