Jack location is tough at times, if it has not been part of the plan as the RV was built.
We had a Thor retrofit and it did nt come out at all as we wanted. One of the big parts of that failure was taking it to Camper World to have them added! We drew up the plan, talked to sales and then the installer simply ignored it all and put things "where he always put them". Of course he seemed to have never done it before and had no idea why we wanted it done the way we drew up!
One of the big hangups of adding after built is find headroom for the type of jacks you choose and that is tough. If you choose the type which folds, it can take a lot of horizontal space to fold. But if choosing the type which extends, rather than fold, It then is hard to find a space for those jacks to come up.
In our case, the installer saw nothing wrong with it coming up under the dinette, so simply cut a hole and built a box under the dinette to cover it! Looked super nice and really made it a trill to set at the dinette!
Where to put the hydraulic pump? He thought it fine to put it in an outside compartment. No concern at all about hanging that much weight on the plastic floor of the compartment!
His reason for that? He said you should never put them outside in the weather!
It kind of left us wondering if he had ever looked at an RV before!
Our first and only brand new RV and we sold it within a year!
My advise? Think and look very carefully before trusting others to make those decisions!