In your travels and happen upon any Viper models , run your hand over the front tires.
Guaranty the tires will be feathered bad !
When I was on the phone with Dave I mentioned it and he made the comment when the new plant expansion was added they added an alignment rack.
Now maybe they had an alignment rack when you visited , but Dave acted like it was all new they just started doing it in late 2015 - 2016 ?
Now if they are doing an alignment last stop out of the shop , they are doing it wrong.
The MH needs to be loaded for the way its going to travel Not empty like it is coming out of the factory
I also brought that up to Dave , I suggested they at bare minimum fill ALL the tanks and even put in an extra few hundred pounds of ?? spread out .
That would give a more actual real life starting point to do an alignment.
Since now I have an Aspect I don't have the big top overhang above the cab.
Neither do the Vipers and every single Viper I've come across the front tires were feathered to straight out cupped bad.
So far we've only put about 2,000 miles on ours with new tires and even tho I need to get an alignment check (because this thing wonders all over the road and gets pushed with even a SUV passing us ! The front tires are showing NO sign of feathering at all.
Yet on 3 different Vipers with less than 2500 miles shown feathering bad !
Thought that was odd them being sold used with those low of miles, that's just about the amount of miles one would have on it delivered out here on the West coast?
The other 4 I have come across had anywhere from 4k to 9k miles on them , obvious that the tires had not been rotated and the front tires needed to be replaced they were cupped and worn so bad.
Had a proper alignment been done it would of at least helped ?.
But I think its more being such a long overhang in the rear and overloading the rear axle its lightened up the front axle too much.
I honestly think the first few years were the best built ones , they have gone through some major growing pains in the last few years...
You know the story on the used 23P I almost bought , that one like yours was a quality built unit !
Back to the OP's question Bilstein's or Koni's .
Have experience with both , like my first post on this thread , go with the Bilsteins and Helwig Anti sway bars.
Even then you Will get pushed by a passing Semi anyone who says they don't are pulling your leg...
I'd like to get a ride in one who says they don't get pushed after replacing the shocks, ASB's etc.
I've done all three shocks (waste of money went with Koni's from the echo chambers here and on other talk forums on how great they are ,,, should have just listen to my gut feelings and stayed with known proven Bilstein's). The ASB's front and rear and the Safe-T-Plus SS . Still need to get an alignment and hoping to be able to get a rear trac bar installed.
Right now it doesn't show one available for 2010 E450 with rear airbag helpers installed. Or at least I can't find somewhere that sells/installs one !